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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30
31#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <drm/ttm/ttm_module.h>
34#include <drm/ttm/ttm_bo_driver.h>
35#include <drm/ttm/ttm_placement.h>
36#include <linux/jiffies.h>
37#include <linux/slab.h>
38#include <linux/sched.h>
39#include <linux/mm.h>
40#include <linux/file.h>
41#include <linux/module.h>
42#include <linux/atomic.h>
43#include <linux/reservation.h>
44
45static void ttm_bo_global_kobj_release(struct kobject *kobj);
46
47static struct attribute ttm_bo_count = {
48 .name = "bo_count",
49 .mode = S_IRUGO
50};
51
52/* default destructor */
53static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
54{
55 kfree(bo);
56}
57
58static inline int ttm_mem_type_from_place(const struct ttm_place *place,
59 uint32_t *mem_type)
60{
61 int pos;
62
63 pos = ffs(place->flags & TTM_PL_MASK_MEM);
64 if (unlikely(!pos))
65 return -EINVAL;
66
67 *mem_type = pos - 1;
68 return 0;
69}
70
71static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
72{
73 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
74 struct drm_printer p = drm_debug_printer(TTM_PFX);
75
76 pr_err(" has_type: %d\n", man->has_type);
77 pr_err(" use_type: %d\n", man->use_type);
78 pr_err(" flags: 0x%08X\n", man->flags);
79 pr_err(" gpu_offset: 0x%08llX\n", man->gpu_offset);
80 pr_err(" size: %llu\n", man->size);
81 pr_err(" available_caching: 0x%08X\n", man->available_caching);
82 pr_err(" default_caching: 0x%08X\n", man->default_caching);
83 if (mem_type != TTM_PL_SYSTEM)
84 (*man->func->debug)(man, &p);
85}
86
87static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
88 struct ttm_placement *placement)
89{
90 int i, ret, mem_type;
91
92 pr_err("No space for %p (%lu pages, %luK, %luM)\n",
93 bo, bo->mem.num_pages, bo->mem.size >> 10,
94 bo->mem.size >> 20);
95 for (i = 0; i < placement->num_placement; i++) {
96 ret = ttm_mem_type_from_place(&placement->placement[i],
97 &mem_type);
98 if (ret)
99 return;
100 pr_err(" placement[%d]=0x%08X (%d)\n",
101 i, placement->placement[i].flags, mem_type);
102 ttm_mem_type_debug(bo->bdev, mem_type);
103 }
104}
105
106static ssize_t ttm_bo_global_show(struct kobject *kobj,
107 struct attribute *attr,
108 char *buffer)
109{
110 struct ttm_bo_global *glob =
111 container_of(kobj, struct ttm_bo_global, kobj);
112
113 return snprintf(buffer, PAGE_SIZE, "%d\n",
114 atomic_read(&glob->bo_count));
115}
116
117static struct attribute *ttm_bo_global_attrs[] = {
118 &ttm_bo_count,
119 NULL
120};
121
122static const struct sysfs_ops ttm_bo_global_ops = {
123 .show = &ttm_bo_global_show
124};
125
126static struct kobj_type ttm_bo_glob_kobj_type = {
127 .release = &ttm_bo_global_kobj_release,
128 .sysfs_ops = &ttm_bo_global_ops,
129 .default_attrs = ttm_bo_global_attrs
130};
131
132
133static inline uint32_t ttm_bo_type_flags(unsigned type)
134{
135 return 1 << (type);
136}
137
138static void ttm_bo_release_list(struct kref *list_kref)
139{
140 struct ttm_buffer_object *bo =
141 container_of(list_kref, struct ttm_buffer_object, list_kref);
142 struct ttm_bo_device *bdev = bo->bdev;
143 size_t acc_size = bo->acc_size;
144
145 BUG_ON(kref_read(&bo->list_kref));
146 BUG_ON(kref_read(&bo->kref));
147 BUG_ON(atomic_read(&bo->cpu_writers));
148 BUG_ON(bo->mem.mm_node != NULL);
149 BUG_ON(!list_empty(&bo->lru));
150 BUG_ON(!list_empty(&bo->ddestroy));
151 ttm_tt_destroy(bo->ttm);
152 atomic_dec(&bo->bdev->glob->bo_count);
153 dma_fence_put(bo->moving);
154 reservation_object_fini(&bo->ttm_resv);
155 mutex_destroy(&bo->wu_mutex);
156 bo->destroy(bo);
157 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
158}
159
160void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
161{
162 struct ttm_bo_device *bdev = bo->bdev;
163 struct ttm_mem_type_manager *man;
164
165 reservation_object_assert_held(bo->resv);
166
167 if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
168 BUG_ON(!list_empty(&bo->lru));
169
170 man = &bdev->man[bo->mem.mem_type];
171 list_add_tail(&bo->lru, &man->lru[bo->priority]);
172 kref_get(&bo->list_kref);
173
174 if (bo->ttm && !(bo->ttm->page_flags &
175 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
176 list_add_tail(&bo->swap,
177 &bdev->glob->swap_lru[bo->priority]);
178 kref_get(&bo->list_kref);
179 }
180 }
181}
182EXPORT_SYMBOL(ttm_bo_add_to_lru);
183
184static void ttm_bo_ref_bug(struct kref *list_kref)
185{
186 BUG();
187}
188
189void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
190{
191 if (!list_empty(&bo->swap)) {
192 list_del_init(&bo->swap);
193 kref_put(&bo->list_kref, ttm_bo_ref_bug);
194 }
195 if (!list_empty(&bo->lru)) {
196 list_del_init(&bo->lru);
197 kref_put(&bo->list_kref, ttm_bo_ref_bug);
198 }
199
200 /*
201 * TODO: Add a driver hook to delete from
202 * driver-specific LRU's here.
203 */
204}
205
206void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
207{
208 struct ttm_bo_global *glob = bo->bdev->glob;
209
210 spin_lock(&glob->lru_lock);
211 ttm_bo_del_from_lru(bo);
212 spin_unlock(&glob->lru_lock);
213}
214EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
215
216void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
217{
218 reservation_object_assert_held(bo->resv);
219
220 ttm_bo_del_from_lru(bo);
221 ttm_bo_add_to_lru(bo);
222}
223EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
224
225static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
226 struct ttm_mem_reg *mem, bool evict,
227 struct ttm_operation_ctx *ctx)
228{
229 struct ttm_bo_device *bdev = bo->bdev;
230 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
231 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
232 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
233 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
234 int ret = 0;
235
236 if (old_is_pci || new_is_pci ||
237 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
238 ret = ttm_mem_io_lock(old_man, true);
239 if (unlikely(ret != 0))
240 goto out_err;
241 ttm_bo_unmap_virtual_locked(bo);
242 ttm_mem_io_unlock(old_man);
243 }
244
245 /*
246 * Create and bind a ttm if required.
247 */
248
249 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
250 if (bo->ttm == NULL) {
251 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
252 ret = ttm_tt_create(bo, zero);
253 if (ret)
254 goto out_err;
255 }
256
257 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
258 if (ret)
259 goto out_err;
260
261 if (mem->mem_type != TTM_PL_SYSTEM) {
262 ret = ttm_tt_bind(bo->ttm, mem, ctx);
263 if (ret)
264 goto out_err;
265 }
266
267 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
268 if (bdev->driver->move_notify)
269 bdev->driver->move_notify(bo, evict, mem);
270 bo->mem = *mem;
271 mem->mm_node = NULL;
272 goto moved;
273 }
274 }
275
276 if (bdev->driver->move_notify)
277 bdev->driver->move_notify(bo, evict, mem);
278
279 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
280 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
281 ret = ttm_bo_move_ttm(bo, ctx, mem);
282 else if (bdev->driver->move)
283 ret = bdev->driver->move(bo, evict, ctx, mem);
284 else
285 ret = ttm_bo_move_memcpy(bo, ctx, mem);
286
287 if (ret) {
288 if (bdev->driver->move_notify) {
289 struct ttm_mem_reg tmp_mem = *mem;
290 *mem = bo->mem;
291 bo->mem = tmp_mem;
292 bdev->driver->move_notify(bo, false, mem);
293 bo->mem = *mem;
294 *mem = tmp_mem;
295 }
296
297 goto out_err;
298 }
299
300moved:
301 if (bo->evicted) {
302 if (bdev->driver->invalidate_caches) {
303 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
304 if (ret)
305 pr_err("Can not flush read caches\n");
306 }
307 bo->evicted = false;
308 }
309
310 if (bo->mem.mm_node)
311 bo->offset = (bo->mem.start << PAGE_SHIFT) +
312 bdev->man[bo->mem.mem_type].gpu_offset;
313 else
314 bo->offset = 0;
315
316 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
317 return 0;
318
319out_err:
320 new_man = &bdev->man[bo->mem.mem_type];
321 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
322 ttm_tt_destroy(bo->ttm);
323 bo->ttm = NULL;
324 }
325
326 return ret;
327}
328
329/**
330 * Call bo::reserved.
331 * Will release GPU memory type usage on destruction.
332 * This is the place to put in driver specific hooks to release
333 * driver private resources.
334 * Will release the bo::reserved lock.
335 */
336
337static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
338{
339 if (bo->bdev->driver->move_notify)
340 bo->bdev->driver->move_notify(bo, false, NULL);
341
342 ttm_tt_destroy(bo->ttm);
343 bo->ttm = NULL;
344 ttm_bo_mem_put(bo, &bo->mem);
345}
346
347static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
348{
349 int r;
350
351 if (bo->resv == &bo->ttm_resv)
352 return 0;
353
354 BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
355
356 r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
357 if (r)
358 reservation_object_unlock(&bo->ttm_resv);
359
360 return r;
361}
362
363static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
364{
365 struct reservation_object_list *fobj;
366 struct dma_fence *fence;
367 int i;
368
369 fobj = reservation_object_get_list(&bo->ttm_resv);
370 fence = reservation_object_get_excl(&bo->ttm_resv);
371 if (fence && !fence->ops->signaled)
372 dma_fence_enable_sw_signaling(fence);
373
374 for (i = 0; fobj && i < fobj->shared_count; ++i) {
375 fence = rcu_dereference_protected(fobj->shared[i],
376 reservation_object_held(bo->resv));
377
378 if (!fence->ops->signaled)
379 dma_fence_enable_sw_signaling(fence);
380 }
381}
382
383static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
384{
385 struct ttm_bo_device *bdev = bo->bdev;
386 struct ttm_bo_global *glob = bdev->glob;
387 int ret;
388
389 ret = ttm_bo_individualize_resv(bo);
390 if (ret) {
391 /* Last resort, if we fail to allocate memory for the
392 * fences block for the BO to become idle
393 */
394 reservation_object_wait_timeout_rcu(bo->resv, true, false,
395 30 * HZ);
396 spin_lock(&glob->lru_lock);
397 goto error;
398 }
399
400 spin_lock(&glob->lru_lock);
401 ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
402 if (!ret) {
403 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
404 ttm_bo_del_from_lru(bo);
405 spin_unlock(&glob->lru_lock);
406 if (bo->resv != &bo->ttm_resv)
407 reservation_object_unlock(&bo->ttm_resv);
408
409 ttm_bo_cleanup_memtype_use(bo);
410 reservation_object_unlock(bo->resv);
411 return;
412 }
413
414 ttm_bo_flush_all_fences(bo);
415
416 /*
417 * Make NO_EVICT bos immediately available to
418 * shrinkers, now that they are queued for
419 * destruction.
420 */
421 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
422 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
423 ttm_bo_add_to_lru(bo);
424 }
425
426 reservation_object_unlock(bo->resv);
427 }
428 if (bo->resv != &bo->ttm_resv)
429 reservation_object_unlock(&bo->ttm_resv);
430
431error:
432 kref_get(&bo->list_kref);
433 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
434 spin_unlock(&glob->lru_lock);
435
436 schedule_delayed_work(&bdev->wq,
437 ((HZ / 100) < 1) ? 1 : HZ / 100);
438}
439
440/**
441 * function ttm_bo_cleanup_refs
442 * If bo idle, remove from delayed- and lru lists, and unref.
443 * If not idle, do nothing.
444 *
445 * Must be called with lru_lock and reservation held, this function
446 * will drop the lru lock and optionally the reservation lock before returning.
447 *
448 * @interruptible Any sleeps should occur interruptibly.
449 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
450 * @unlock_resv Unlock the reservation lock as well.
451 */
452
453static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
454 bool interruptible, bool no_wait_gpu,
455 bool unlock_resv)
456{
457 struct ttm_bo_global *glob = bo->bdev->glob;
458 struct reservation_object *resv;
459 int ret;
460
461 if (unlikely(list_empty(&bo->ddestroy)))
462 resv = bo->resv;
463 else
464 resv = &bo->ttm_resv;
465
466 if (reservation_object_test_signaled_rcu(resv, true))
467 ret = 0;
468 else
469 ret = -EBUSY;
470
471 if (ret && !no_wait_gpu) {
472 long lret;
473
474 if (unlock_resv)
475 reservation_object_unlock(bo->resv);
476 spin_unlock(&glob->lru_lock);
477
478 lret = reservation_object_wait_timeout_rcu(resv, true,
479 interruptible,
480 30 * HZ);
481
482 if (lret < 0)
483 return lret;
484 else if (lret == 0)
485 return -EBUSY;
486
487 spin_lock(&glob->lru_lock);
488 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
489 /*
490 * We raced, and lost, someone else holds the reservation now,
491 * and is probably busy in ttm_bo_cleanup_memtype_use.
492 *
493 * Even if it's not the case, because we finished waiting any
494 * delayed destruction would succeed, so just return success
495 * here.
496 */
497 spin_unlock(&glob->lru_lock);
498 return 0;
499 }
500 ret = 0;
501 }
502
503 if (ret || unlikely(list_empty(&bo->ddestroy))) {
504 if (unlock_resv)
505 reservation_object_unlock(bo->resv);
506 spin_unlock(&glob->lru_lock);
507 return ret;
508 }
509
510 ttm_bo_del_from_lru(bo);
511 list_del_init(&bo->ddestroy);
512 kref_put(&bo->list_kref, ttm_bo_ref_bug);
513
514 spin_unlock(&glob->lru_lock);
515 ttm_bo_cleanup_memtype_use(bo);
516
517 if (unlock_resv)
518 reservation_object_unlock(bo->resv);
519
520 return 0;
521}
522
523/**
524 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
525 * encountered buffers.
526 */
527static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
528{
529 struct ttm_bo_global *glob = bdev->glob;
530 struct list_head removed;
531 bool empty;
532
533 INIT_LIST_HEAD(&removed);
534
535 spin_lock(&glob->lru_lock);
536 while (!list_empty(&bdev->ddestroy)) {
537 struct ttm_buffer_object *bo;
538
539 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
540 ddestroy);
541 kref_get(&bo->list_kref);
542 list_move_tail(&bo->ddestroy, &removed);
543
544 if (remove_all || bo->resv != &bo->ttm_resv) {
545 spin_unlock(&glob->lru_lock);
546 reservation_object_lock(bo->resv, NULL);
547
548 spin_lock(&glob->lru_lock);
549 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
550
551 } else if (reservation_object_trylock(bo->resv)) {
552 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
553 } else {
554 spin_unlock(&glob->lru_lock);
555 }
556
557 kref_put(&bo->list_kref, ttm_bo_release_list);
558 spin_lock(&glob->lru_lock);
559 }
560 list_splice_tail(&removed, &bdev->ddestroy);
561 empty = list_empty(&bdev->ddestroy);
562 spin_unlock(&glob->lru_lock);
563
564 return empty;
565}
566
567static void ttm_bo_delayed_workqueue(struct work_struct *work)
568{
569 struct ttm_bo_device *bdev =
570 container_of(work, struct ttm_bo_device, wq.work);
571
572 if (!ttm_bo_delayed_delete(bdev, false))
573 schedule_delayed_work(&bdev->wq,
574 ((HZ / 100) < 1) ? 1 : HZ / 100);
575}
576
577static void ttm_bo_release(struct kref *kref)
578{
579 struct ttm_buffer_object *bo =
580 container_of(kref, struct ttm_buffer_object, kref);
581 struct ttm_bo_device *bdev = bo->bdev;
582 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
583
584 drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
585 ttm_mem_io_lock(man, false);
586 ttm_mem_io_free_vm(bo);
587 ttm_mem_io_unlock(man);
588 ttm_bo_cleanup_refs_or_queue(bo);
589 kref_put(&bo->list_kref, ttm_bo_release_list);
590}
591
592void ttm_bo_unref(struct ttm_buffer_object **p_bo)
593{
594 struct ttm_buffer_object *bo = *p_bo;
595
596 *p_bo = NULL;
597 kref_put(&bo->kref, ttm_bo_release);
598}
599EXPORT_SYMBOL(ttm_bo_unref);
600
601int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
602{
603 return cancel_delayed_work_sync(&bdev->wq);
604}
605EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
606
607void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
608{
609 if (resched)
610 schedule_delayed_work(&bdev->wq,
611 ((HZ / 100) < 1) ? 1 : HZ / 100);
612}
613EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
614
615static int ttm_bo_evict(struct ttm_buffer_object *bo,
616 struct ttm_operation_ctx *ctx)
617{
618 struct ttm_bo_device *bdev = bo->bdev;
619 struct ttm_mem_reg evict_mem;
620 struct ttm_placement placement;
621 int ret = 0;
622
623 reservation_object_assert_held(bo->resv);
624
625 placement.num_placement = 0;
626 placement.num_busy_placement = 0;
627 bdev->driver->evict_flags(bo, &placement);
628
629 if (!placement.num_placement && !placement.num_busy_placement) {
630 ret = ttm_bo_pipeline_gutting(bo);
631 if (ret)
632 return ret;
633
634 return ttm_tt_create(bo, false);
635 }
636
637 evict_mem = bo->mem;
638 evict_mem.mm_node = NULL;
639 evict_mem.bus.io_reserved_vm = false;
640 evict_mem.bus.io_reserved_count = 0;
641
642 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
643 if (ret) {
644 if (ret != -ERESTARTSYS) {
645 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
646 bo);
647 ttm_bo_mem_space_debug(bo, &placement);
648 }
649 goto out;
650 }
651
652 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
653 if (unlikely(ret)) {
654 if (ret != -ERESTARTSYS)
655 pr_err("Buffer eviction failed\n");
656 ttm_bo_mem_put(bo, &evict_mem);
657 goto out;
658 }
659 bo->evicted = true;
660out:
661 return ret;
662}
663
664bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
665 const struct ttm_place *place)
666{
667 /* Don't evict this BO if it's outside of the
668 * requested placement range
669 */
670 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
671 (place->lpfn && place->lpfn <= bo->mem.start))
672 return false;
673
674 return true;
675}
676EXPORT_SYMBOL(ttm_bo_eviction_valuable);
677
678/**
679 * Check the target bo is allowable to be evicted or swapout, including cases:
680 *
681 * a. if share same reservation object with ctx->resv, have assumption
682 * reservation objects should already be locked, so not lock again and
683 * return true directly when either the opreation allow_reserved_eviction
684 * or the target bo already is in delayed free list;
685 *
686 * b. Otherwise, trylock it.
687 */
688static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
689 struct ttm_operation_ctx *ctx, bool *locked)
690{
691 bool ret = false;
692
693 *locked = false;
694 if (bo->resv == ctx->resv) {
695 reservation_object_assert_held(bo->resv);
696 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
697 || !list_empty(&bo->ddestroy))
698 ret = true;
699 } else {
700 *locked = reservation_object_trylock(bo->resv);
701 ret = *locked;
702 }
703
704 return ret;
705}
706
707static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
708 uint32_t mem_type,
709 const struct ttm_place *place,
710 struct ttm_operation_ctx *ctx)
711{
712 struct ttm_bo_global *glob = bdev->glob;
713 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
714 struct ttm_buffer_object *bo = NULL;
715 bool locked = false;
716 unsigned i;
717 int ret;
718
719 spin_lock(&glob->lru_lock);
720 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
721 list_for_each_entry(bo, &man->lru[i], lru) {
722 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
723 continue;
724
725 if (place && !bdev->driver->eviction_valuable(bo,
726 place)) {
727 if (locked)
728 reservation_object_unlock(bo->resv);
729 continue;
730 }
731 break;
732 }
733
734 /* If the inner loop terminated early, we have our candidate */
735 if (&bo->lru != &man->lru[i])
736 break;
737
738 bo = NULL;
739 }
740
741 if (!bo) {
742 spin_unlock(&glob->lru_lock);
743 return -EBUSY;
744 }
745
746 kref_get(&bo->list_kref);
747
748 if (!list_empty(&bo->ddestroy)) {
749 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
750 ctx->no_wait_gpu, locked);
751 kref_put(&bo->list_kref, ttm_bo_release_list);
752 return ret;
753 }
754
755 ttm_bo_del_from_lru(bo);
756 spin_unlock(&glob->lru_lock);
757
758 ret = ttm_bo_evict(bo, ctx);
759 if (locked) {
760 ttm_bo_unreserve(bo);
761 } else {
762 spin_lock(&glob->lru_lock);
763 ttm_bo_add_to_lru(bo);
764 spin_unlock(&glob->lru_lock);
765 }
766
767 kref_put(&bo->list_kref, ttm_bo_release_list);
768 return ret;
769}
770
771void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
772{
773 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
774
775 if (mem->mm_node)
776 (*man->func->put_node)(man, mem);
777}
778EXPORT_SYMBOL(ttm_bo_mem_put);
779
780/**
781 * Add the last move fence to the BO and reserve a new shared slot.
782 */
783static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
784 struct ttm_mem_type_manager *man,
785 struct ttm_mem_reg *mem)
786{
787 struct dma_fence *fence;
788 int ret;
789
790 spin_lock(&man->move_lock);
791 fence = dma_fence_get(man->move);
792 spin_unlock(&man->move_lock);
793
794 if (fence) {
795 reservation_object_add_shared_fence(bo->resv, fence);
796
797 ret = reservation_object_reserve_shared(bo->resv);
798 if (unlikely(ret))
799 return ret;
800
801 dma_fence_put(bo->moving);
802 bo->moving = fence;
803 }
804
805 return 0;
806}
807
808/**
809 * Repeatedly evict memory from the LRU for @mem_type until we create enough
810 * space, or we've evicted everything and there isn't enough space.
811 */
812static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
813 uint32_t mem_type,
814 const struct ttm_place *place,
815 struct ttm_mem_reg *mem,
816 struct ttm_operation_ctx *ctx)
817{
818 struct ttm_bo_device *bdev = bo->bdev;
819 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
820 int ret;
821
822 do {
823 ret = (*man->func->get_node)(man, bo, place, mem);
824 if (unlikely(ret != 0))
825 return ret;
826 if (mem->mm_node)
827 break;
828 ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
829 if (unlikely(ret != 0))
830 return ret;
831 } while (1);
832 mem->mem_type = mem_type;
833 return ttm_bo_add_move_fence(bo, man, mem);
834}
835
836static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
837 uint32_t cur_placement,
838 uint32_t proposed_placement)
839{
840 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
841 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
842
843 /**
844 * Keep current caching if possible.
845 */
846
847 if ((cur_placement & caching) != 0)
848 result |= (cur_placement & caching);
849 else if ((man->default_caching & caching) != 0)
850 result |= man->default_caching;
851 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
852 result |= TTM_PL_FLAG_CACHED;
853 else if ((TTM_PL_FLAG_WC & caching) != 0)
854 result |= TTM_PL_FLAG_WC;
855 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
856 result |= TTM_PL_FLAG_UNCACHED;
857
858 return result;
859}
860
861static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
862 uint32_t mem_type,
863 const struct ttm_place *place,
864 uint32_t *masked_placement)
865{
866 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
867
868 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
869 return false;
870
871 if ((place->flags & man->available_caching) == 0)
872 return false;
873
874 cur_flags |= (place->flags & man->available_caching);
875
876 *masked_placement = cur_flags;
877 return true;
878}
879
880/**
881 * Creates space for memory region @mem according to its type.
882 *
883 * This function first searches for free space in compatible memory types in
884 * the priority order defined by the driver. If free space isn't found, then
885 * ttm_bo_mem_force_space is attempted in priority order to evict and find
886 * space.
887 */
888int ttm_bo_mem_space(struct ttm_buffer_object *bo,
889 struct ttm_placement *placement,
890 struct ttm_mem_reg *mem,
891 struct ttm_operation_ctx *ctx)
892{
893 struct ttm_bo_device *bdev = bo->bdev;
894 struct ttm_mem_type_manager *man;
895 uint32_t mem_type = TTM_PL_SYSTEM;
896 uint32_t cur_flags = 0;
897 bool type_found = false;
898 bool type_ok = false;
899 bool has_erestartsys = false;
900 int i, ret;
901
902 ret = reservation_object_reserve_shared(bo->resv);
903 if (unlikely(ret))
904 return ret;
905
906 mem->mm_node = NULL;
907 for (i = 0; i < placement->num_placement; ++i) {
908 const struct ttm_place *place = &placement->placement[i];
909
910 ret = ttm_mem_type_from_place(place, &mem_type);
911 if (ret)
912 return ret;
913 man = &bdev->man[mem_type];
914 if (!man->has_type || !man->use_type)
915 continue;
916
917 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
918 &cur_flags);
919
920 if (!type_ok)
921 continue;
922
923 type_found = true;
924 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
925 cur_flags);
926 /*
927 * Use the access and other non-mapping-related flag bits from
928 * the memory placement flags to the current flags
929 */
930 ttm_flag_masked(&cur_flags, place->flags,
931 ~TTM_PL_MASK_MEMTYPE);
932
933 if (mem_type == TTM_PL_SYSTEM)
934 break;
935
936 ret = (*man->func->get_node)(man, bo, place, mem);
937 if (unlikely(ret))
938 return ret;
939
940 if (mem->mm_node) {
941 ret = ttm_bo_add_move_fence(bo, man, mem);
942 if (unlikely(ret)) {
943 (*man->func->put_node)(man, mem);
944 return ret;
945 }
946 break;
947 }
948 }
949
950 if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
951 mem->mem_type = mem_type;
952 mem->placement = cur_flags;
953 return 0;
954 }
955
956 for (i = 0; i < placement->num_busy_placement; ++i) {
957 const struct ttm_place *place = &placement->busy_placement[i];
958
959 ret = ttm_mem_type_from_place(place, &mem_type);
960 if (ret)
961 return ret;
962 man = &bdev->man[mem_type];
963 if (!man->has_type || !man->use_type)
964 continue;
965 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
966 continue;
967
968 type_found = true;
969 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
970 cur_flags);
971 /*
972 * Use the access and other non-mapping-related flag bits from
973 * the memory placement flags to the current flags
974 */
975 ttm_flag_masked(&cur_flags, place->flags,
976 ~TTM_PL_MASK_MEMTYPE);
977
978 if (mem_type == TTM_PL_SYSTEM) {
979 mem->mem_type = mem_type;
980 mem->placement = cur_flags;
981 mem->mm_node = NULL;
982 return 0;
983 }
984
985 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem, ctx);
986 if (ret == 0 && mem->mm_node) {
987 mem->placement = cur_flags;
988 return 0;
989 }
990 if (ret == -ERESTARTSYS)
991 has_erestartsys = true;
992 }
993
994 if (!type_found) {
995 pr_err(TTM_PFX "No compatible memory type found\n");
996 return -EINVAL;
997 }
998
999 return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1000}
1001EXPORT_SYMBOL(ttm_bo_mem_space);
1002
1003static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1004 struct ttm_placement *placement,
1005 struct ttm_operation_ctx *ctx)
1006{
1007 int ret = 0;
1008 struct ttm_mem_reg mem;
1009
1010 reservation_object_assert_held(bo->resv);
1011
1012 mem.num_pages = bo->num_pages;
1013 mem.size = mem.num_pages << PAGE_SHIFT;
1014 mem.page_alignment = bo->mem.page_alignment;
1015 mem.bus.io_reserved_vm = false;
1016 mem.bus.io_reserved_count = 0;
1017 /*
1018 * Determine where to move the buffer.
1019 */
1020 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1021 if (ret)
1022 goto out_unlock;
1023 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1024out_unlock:
1025 if (ret && mem.mm_node)
1026 ttm_bo_mem_put(bo, &mem);
1027 return ret;
1028}
1029
1030static bool ttm_bo_places_compat(const struct ttm_place *places,
1031 unsigned num_placement,
1032 struct ttm_mem_reg *mem,
1033 uint32_t *new_flags)
1034{
1035 unsigned i;
1036
1037 for (i = 0; i < num_placement; i++) {
1038 const struct ttm_place *heap = &places[i];
1039
1040 if (mem->mm_node && (mem->start < heap->fpfn ||
1041 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1042 continue;
1043
1044 *new_flags = heap->flags;
1045 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1046 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1047 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1048 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1049 return true;
1050 }
1051 return false;
1052}
1053
1054bool ttm_bo_mem_compat(struct ttm_placement *placement,
1055 struct ttm_mem_reg *mem,
1056 uint32_t *new_flags)
1057{
1058 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1059 mem, new_flags))
1060 return true;
1061
1062 if ((placement->busy_placement != placement->placement ||
1063 placement->num_busy_placement > placement->num_placement) &&
1064 ttm_bo_places_compat(placement->busy_placement,
1065 placement->num_busy_placement,
1066 mem, new_flags))
1067 return true;
1068
1069 return false;
1070}
1071EXPORT_SYMBOL(ttm_bo_mem_compat);
1072
1073int ttm_bo_validate(struct ttm_buffer_object *bo,
1074 struct ttm_placement *placement,
1075 struct ttm_operation_ctx *ctx)
1076{
1077 int ret;
1078 uint32_t new_flags;
1079
1080 reservation_object_assert_held(bo->resv);
1081 /*
1082 * Check whether we need to move buffer.
1083 */
1084 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1085 ret = ttm_bo_move_buffer(bo, placement, ctx);
1086 if (ret)
1087 return ret;
1088 } else {
1089 /*
1090 * Use the access and other non-mapping-related flag bits from
1091 * the compatible memory placement flags to the active flags
1092 */
1093 ttm_flag_masked(&bo->mem.placement, new_flags,
1094 ~TTM_PL_MASK_MEMTYPE);
1095 }
1096 /*
1097 * We might need to add a TTM.
1098 */
1099 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1100 ret = ttm_tt_create(bo, true);
1101 if (ret)
1102 return ret;
1103 }
1104 return 0;
1105}
1106EXPORT_SYMBOL(ttm_bo_validate);
1107
1108int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1109 struct ttm_buffer_object *bo,
1110 unsigned long size,
1111 enum ttm_bo_type type,
1112 struct ttm_placement *placement,
1113 uint32_t page_alignment,
1114 struct ttm_operation_ctx *ctx,
1115 size_t acc_size,
1116 struct sg_table *sg,
1117 struct reservation_object *resv,
1118 void (*destroy) (struct ttm_buffer_object *))
1119{
1120 int ret = 0;
1121 unsigned long num_pages;
1122 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1123 bool locked;
1124
1125 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1126 if (ret) {
1127 pr_err("Out of kernel memory\n");
1128 if (destroy)
1129 (*destroy)(bo);
1130 else
1131 kfree(bo);
1132 return -ENOMEM;
1133 }
1134
1135 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1136 if (num_pages == 0) {
1137 pr_err("Illegal buffer object size\n");
1138 if (destroy)
1139 (*destroy)(bo);
1140 else
1141 kfree(bo);
1142 ttm_mem_global_free(mem_glob, acc_size);
1143 return -EINVAL;
1144 }
1145 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1146
1147 kref_init(&bo->kref);
1148 kref_init(&bo->list_kref);
1149 atomic_set(&bo->cpu_writers, 0);
1150 INIT_LIST_HEAD(&bo->lru);
1151 INIT_LIST_HEAD(&bo->ddestroy);
1152 INIT_LIST_HEAD(&bo->swap);
1153 INIT_LIST_HEAD(&bo->io_reserve_lru);
1154 mutex_init(&bo->wu_mutex);
1155 bo->bdev = bdev;
1156 bo->type = type;
1157 bo->num_pages = num_pages;
1158 bo->mem.size = num_pages << PAGE_SHIFT;
1159 bo->mem.mem_type = TTM_PL_SYSTEM;
1160 bo->mem.num_pages = bo->num_pages;
1161 bo->mem.mm_node = NULL;
1162 bo->mem.page_alignment = page_alignment;
1163 bo->mem.bus.io_reserved_vm = false;
1164 bo->mem.bus.io_reserved_count = 0;
1165 bo->moving = NULL;
1166 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1167 bo->acc_size = acc_size;
1168 bo->sg = sg;
1169 if (resv) {
1170 bo->resv = resv;
1171 reservation_object_assert_held(bo->resv);
1172 } else {
1173 bo->resv = &bo->ttm_resv;
1174 }
1175 reservation_object_init(&bo->ttm_resv);
1176 atomic_inc(&bo->bdev->glob->bo_count);
1177 drm_vma_node_reset(&bo->vma_node);
1178 bo->priority = 0;
1179
1180 /*
1181 * For ttm_bo_type_device buffers, allocate
1182 * address space from the device.
1183 */
1184 if (bo->type == ttm_bo_type_device ||
1185 bo->type == ttm_bo_type_sg)
1186 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1187 bo->mem.num_pages);
1188
1189 /* passed reservation objects should already be locked,
1190 * since otherwise lockdep will be angered in radeon.
1191 */
1192 if (!resv) {
1193 locked = reservation_object_trylock(bo->resv);
1194 WARN_ON(!locked);
1195 }
1196
1197 if (likely(!ret))
1198 ret = ttm_bo_validate(bo, placement, ctx);
1199
1200 if (unlikely(ret)) {
1201 if (!resv)
1202 ttm_bo_unreserve(bo);
1203
1204 ttm_bo_unref(&bo);
1205 return ret;
1206 }
1207
1208 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1209 spin_lock(&bdev->glob->lru_lock);
1210 ttm_bo_add_to_lru(bo);
1211 spin_unlock(&bdev->glob->lru_lock);
1212 }
1213
1214 return ret;
1215}
1216EXPORT_SYMBOL(ttm_bo_init_reserved);
1217
1218int ttm_bo_init(struct ttm_bo_device *bdev,
1219 struct ttm_buffer_object *bo,
1220 unsigned long size,
1221 enum ttm_bo_type type,
1222 struct ttm_placement *placement,
1223 uint32_t page_alignment,
1224 bool interruptible,
1225 size_t acc_size,
1226 struct sg_table *sg,
1227 struct reservation_object *resv,
1228 void (*destroy) (struct ttm_buffer_object *))
1229{
1230 struct ttm_operation_ctx ctx = { interruptible, false };
1231 int ret;
1232
1233 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1234 page_alignment, &ctx, acc_size,
1235 sg, resv, destroy);
1236 if (ret)
1237 return ret;
1238
1239 if (!resv)
1240 ttm_bo_unreserve(bo);
1241
1242 return 0;
1243}
1244EXPORT_SYMBOL(ttm_bo_init);
1245
1246size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1247 unsigned long bo_size,
1248 unsigned struct_size)
1249{
1250 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1251 size_t size = 0;
1252
1253 size += ttm_round_pot(struct_size);
1254 size += ttm_round_pot(npages * sizeof(void *));
1255 size += ttm_round_pot(sizeof(struct ttm_tt));
1256 return size;
1257}
1258EXPORT_SYMBOL(ttm_bo_acc_size);
1259
1260size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1261 unsigned long bo_size,
1262 unsigned struct_size)
1263{
1264 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1265 size_t size = 0;
1266
1267 size += ttm_round_pot(struct_size);
1268 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1269 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1270 return size;
1271}
1272EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1273
1274int ttm_bo_create(struct ttm_bo_device *bdev,
1275 unsigned long size,
1276 enum ttm_bo_type type,
1277 struct ttm_placement *placement,
1278 uint32_t page_alignment,
1279 bool interruptible,
1280 struct ttm_buffer_object **p_bo)
1281{
1282 struct ttm_buffer_object *bo;
1283 size_t acc_size;
1284 int ret;
1285
1286 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1287 if (unlikely(bo == NULL))
1288 return -ENOMEM;
1289
1290 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1291 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1292 interruptible, acc_size,
1293 NULL, NULL, NULL);
1294 if (likely(ret == 0))
1295 *p_bo = bo;
1296
1297 return ret;
1298}
1299EXPORT_SYMBOL(ttm_bo_create);
1300
1301static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1302 unsigned mem_type)
1303{
1304 struct ttm_operation_ctx ctx = {
1305 .interruptible = false,
1306 .no_wait_gpu = false,
1307 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1308 };
1309 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1310 struct ttm_bo_global *glob = bdev->glob;
1311 struct dma_fence *fence;
1312 int ret;
1313 unsigned i;
1314
1315 /*
1316 * Can't use standard list traversal since we're unlocking.
1317 */
1318
1319 spin_lock(&glob->lru_lock);
1320 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1321 while (!list_empty(&man->lru[i])) {
1322 spin_unlock(&glob->lru_lock);
1323 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx);
1324 if (ret)
1325 return ret;
1326 spin_lock(&glob->lru_lock);
1327 }
1328 }
1329 spin_unlock(&glob->lru_lock);
1330
1331 spin_lock(&man->move_lock);
1332 fence = dma_fence_get(man->move);
1333 spin_unlock(&man->move_lock);
1334
1335 if (fence) {
1336 ret = dma_fence_wait(fence, false);
1337 dma_fence_put(fence);
1338 if (ret)
1339 return ret;
1340 }
1341
1342 return 0;
1343}
1344
1345int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1346{
1347 struct ttm_mem_type_manager *man;
1348 int ret = -EINVAL;
1349
1350 if (mem_type >= TTM_NUM_MEM_TYPES) {
1351 pr_err("Illegal memory type %d\n", mem_type);
1352 return ret;
1353 }
1354 man = &bdev->man[mem_type];
1355
1356 if (!man->has_type) {
1357 pr_err("Trying to take down uninitialized memory manager type %u\n",
1358 mem_type);
1359 return ret;
1360 }
1361
1362 man->use_type = false;
1363 man->has_type = false;
1364
1365 ret = 0;
1366 if (mem_type > 0) {
1367 ret = ttm_bo_force_list_clean(bdev, mem_type);
1368 if (ret) {
1369 pr_err("Cleanup eviction failed\n");
1370 return ret;
1371 }
1372
1373 ret = (*man->func->takedown)(man);
1374 }
1375
1376 dma_fence_put(man->move);
1377 man->move = NULL;
1378
1379 return ret;
1380}
1381EXPORT_SYMBOL(ttm_bo_clean_mm);
1382
1383int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1384{
1385 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1386
1387 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1388 pr_err("Illegal memory manager memory type %u\n", mem_type);
1389 return -EINVAL;
1390 }
1391
1392 if (!man->has_type) {
1393 pr_err("Memory type %u has not been initialized\n", mem_type);
1394 return 0;
1395 }
1396
1397 return ttm_bo_force_list_clean(bdev, mem_type);
1398}
1399EXPORT_SYMBOL(ttm_bo_evict_mm);
1400
1401int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1402 unsigned long p_size)
1403{
1404 int ret;
1405 struct ttm_mem_type_manager *man;
1406 unsigned i;
1407
1408 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1409 man = &bdev->man[type];
1410 BUG_ON(man->has_type);
1411 man->io_reserve_fastpath = true;
1412 man->use_io_reserve_lru = false;
1413 mutex_init(&man->io_reserve_mutex);
1414 spin_lock_init(&man->move_lock);
1415 INIT_LIST_HEAD(&man->io_reserve_lru);
1416
1417 ret = bdev->driver->init_mem_type(bdev, type, man);
1418 if (ret)
1419 return ret;
1420 man->bdev = bdev;
1421
1422 if (type != TTM_PL_SYSTEM) {
1423 ret = (*man->func->init)(man, p_size);
1424 if (ret)
1425 return ret;
1426 }
1427 man->has_type = true;
1428 man->use_type = true;
1429 man->size = p_size;
1430
1431 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1432 INIT_LIST_HEAD(&man->lru[i]);
1433 man->move = NULL;
1434
1435 return 0;
1436}
1437EXPORT_SYMBOL(ttm_bo_init_mm);
1438
1439static void ttm_bo_global_kobj_release(struct kobject *kobj)
1440{
1441 struct ttm_bo_global *glob =
1442 container_of(kobj, struct ttm_bo_global, kobj);
1443
1444 __free_page(glob->dummy_read_page);
1445 kfree(glob);
1446}
1447
1448void ttm_bo_global_release(struct drm_global_reference *ref)
1449{
1450 struct ttm_bo_global *glob = ref->object;
1451
1452 kobject_del(&glob->kobj);
1453 kobject_put(&glob->kobj);
1454}
1455EXPORT_SYMBOL(ttm_bo_global_release);
1456
1457int ttm_bo_global_init(struct drm_global_reference *ref)
1458{
1459 struct ttm_bo_global_ref *bo_ref =
1460 container_of(ref, struct ttm_bo_global_ref, ref);
1461 struct ttm_bo_global *glob = ref->object;
1462 int ret;
1463 unsigned i;
1464
1465 mutex_init(&glob->device_list_mutex);
1466 spin_lock_init(&glob->lru_lock);
1467 glob->mem_glob = bo_ref->mem_glob;
1468 glob->mem_glob->bo_glob = glob;
1469 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1470
1471 if (unlikely(glob->dummy_read_page == NULL)) {
1472 ret = -ENOMEM;
1473 goto out_no_drp;
1474 }
1475
1476 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1477 INIT_LIST_HEAD(&glob->swap_lru[i]);
1478 INIT_LIST_HEAD(&glob->device_list);
1479 atomic_set(&glob->bo_count, 0);
1480
1481 ret = kobject_init_and_add(
1482 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1483 if (unlikely(ret != 0))
1484 kobject_put(&glob->kobj);
1485 return ret;
1486out_no_drp:
1487 kfree(glob);
1488 return ret;
1489}
1490EXPORT_SYMBOL(ttm_bo_global_init);
1491
1492
1493int ttm_bo_device_release(struct ttm_bo_device *bdev)
1494{
1495 int ret = 0;
1496 unsigned i = TTM_NUM_MEM_TYPES;
1497 struct ttm_mem_type_manager *man;
1498 struct ttm_bo_global *glob = bdev->glob;
1499
1500 while (i--) {
1501 man = &bdev->man[i];
1502 if (man->has_type) {
1503 man->use_type = false;
1504 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1505 ret = -EBUSY;
1506 pr_err("DRM memory manager type %d is not clean\n",
1507 i);
1508 }
1509 man->has_type = false;
1510 }
1511 }
1512
1513 mutex_lock(&glob->device_list_mutex);
1514 list_del(&bdev->device_list);
1515 mutex_unlock(&glob->device_list_mutex);
1516
1517 cancel_delayed_work_sync(&bdev->wq);
1518
1519 if (ttm_bo_delayed_delete(bdev, true))
1520 pr_debug("Delayed destroy list was clean\n");
1521
1522 spin_lock(&glob->lru_lock);
1523 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1524 if (list_empty(&bdev->man[0].lru[0]))
1525 pr_debug("Swap list %d was clean\n", i);
1526 spin_unlock(&glob->lru_lock);
1527
1528 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1529
1530 return ret;
1531}
1532EXPORT_SYMBOL(ttm_bo_device_release);
1533
1534int ttm_bo_device_init(struct ttm_bo_device *bdev,
1535 struct ttm_bo_global *glob,
1536 struct ttm_bo_driver *driver,
1537 struct address_space *mapping,
1538 uint64_t file_page_offset,
1539 bool need_dma32)
1540{
1541 int ret = -EINVAL;
1542
1543 bdev->driver = driver;
1544
1545 memset(bdev->man, 0, sizeof(bdev->man));
1546
1547 /*
1548 * Initialize the system memory buffer type.
1549 * Other types need to be driver / IOCTL initialized.
1550 */
1551 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1552 if (unlikely(ret != 0))
1553 goto out_no_sys;
1554
1555 drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1556 0x10000000);
1557 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1558 INIT_LIST_HEAD(&bdev->ddestroy);
1559 bdev->dev_mapping = mapping;
1560 bdev->glob = glob;
1561 bdev->need_dma32 = need_dma32;
1562 mutex_lock(&glob->device_list_mutex);
1563 list_add_tail(&bdev->device_list, &glob->device_list);
1564 mutex_unlock(&glob->device_list_mutex);
1565
1566 return 0;
1567out_no_sys:
1568 return ret;
1569}
1570EXPORT_SYMBOL(ttm_bo_device_init);
1571
1572/*
1573 * buffer object vm functions.
1574 */
1575
1576bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1577{
1578 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1579
1580 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1581 if (mem->mem_type == TTM_PL_SYSTEM)
1582 return false;
1583
1584 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1585 return false;
1586
1587 if (mem->placement & TTM_PL_FLAG_CACHED)
1588 return false;
1589 }
1590 return true;
1591}
1592
1593void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1594{
1595 struct ttm_bo_device *bdev = bo->bdev;
1596
1597 drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1598 ttm_mem_io_free_vm(bo);
1599}
1600
1601void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1602{
1603 struct ttm_bo_device *bdev = bo->bdev;
1604 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1605
1606 ttm_mem_io_lock(man, false);
1607 ttm_bo_unmap_virtual_locked(bo);
1608 ttm_mem_io_unlock(man);
1609}
1610
1611
1612EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1613
1614int ttm_bo_wait(struct ttm_buffer_object *bo,
1615 bool interruptible, bool no_wait)
1616{
1617 long timeout = 15 * HZ;
1618
1619 if (no_wait) {
1620 if (reservation_object_test_signaled_rcu(bo->resv, true))
1621 return 0;
1622 else
1623 return -EBUSY;
1624 }
1625
1626 timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1627 interruptible, timeout);
1628 if (timeout < 0)
1629 return timeout;
1630
1631 if (timeout == 0)
1632 return -EBUSY;
1633
1634 reservation_object_add_excl_fence(bo->resv, NULL);
1635 return 0;
1636}
1637EXPORT_SYMBOL(ttm_bo_wait);
1638
1639int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1640{
1641 int ret = 0;
1642
1643 /*
1644 * Using ttm_bo_reserve makes sure the lru lists are updated.
1645 */
1646
1647 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1648 if (unlikely(ret != 0))
1649 return ret;
1650 ret = ttm_bo_wait(bo, true, no_wait);
1651 if (likely(ret == 0))
1652 atomic_inc(&bo->cpu_writers);
1653 ttm_bo_unreserve(bo);
1654 return ret;
1655}
1656EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1657
1658void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1659{
1660 atomic_dec(&bo->cpu_writers);
1661}
1662EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1663
1664/**
1665 * A buffer object shrink method that tries to swap out the first
1666 * buffer object on the bo_global::swap_lru list.
1667 */
1668int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1669{
1670 struct ttm_buffer_object *bo;
1671 int ret = -EBUSY;
1672 bool locked;
1673 unsigned i;
1674
1675 spin_lock(&glob->lru_lock);
1676 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1677 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1678 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
1679 ret = 0;
1680 break;
1681 }
1682 }
1683 if (!ret)
1684 break;
1685 }
1686
1687 if (ret) {
1688 spin_unlock(&glob->lru_lock);
1689 return ret;
1690 }
1691
1692 kref_get(&bo->list_kref);
1693
1694 if (!list_empty(&bo->ddestroy)) {
1695 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1696 kref_put(&bo->list_kref, ttm_bo_release_list);
1697 return ret;
1698 }
1699
1700 ttm_bo_del_from_lru(bo);
1701 spin_unlock(&glob->lru_lock);
1702
1703 /**
1704 * Move to system cached
1705 */
1706
1707 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1708 bo->ttm->caching_state != tt_cached) {
1709 struct ttm_operation_ctx ctx = { false, false };
1710 struct ttm_mem_reg evict_mem;
1711
1712 evict_mem = bo->mem;
1713 evict_mem.mm_node = NULL;
1714 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1715 evict_mem.mem_type = TTM_PL_SYSTEM;
1716
1717 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1718 if (unlikely(ret != 0))
1719 goto out;
1720 }
1721
1722 /**
1723 * Make sure BO is idle.
1724 */
1725
1726 ret = ttm_bo_wait(bo, false, false);
1727 if (unlikely(ret != 0))
1728 goto out;
1729
1730 ttm_bo_unmap_virtual(bo);
1731
1732 /**
1733 * Swap out. Buffer will be swapped in again as soon as
1734 * anyone tries to access a ttm page.
1735 */
1736
1737 if (bo->bdev->driver->swap_notify)
1738 bo->bdev->driver->swap_notify(bo);
1739
1740 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1741out:
1742
1743 /**
1744 *
1745 * Unreserve without putting on LRU to avoid swapping out an
1746 * already swapped buffer.
1747 */
1748 if (locked)
1749 reservation_object_unlock(bo->resv);
1750 kref_put(&bo->list_kref, ttm_bo_release_list);
1751 return ret;
1752}
1753EXPORT_SYMBOL(ttm_bo_swapout);
1754
1755void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1756{
1757 struct ttm_operation_ctx ctx = {
1758 .interruptible = false,
1759 .no_wait_gpu = false
1760 };
1761
1762 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1763 ;
1764}
1765EXPORT_SYMBOL(ttm_bo_swapout_all);
1766
1767/**
1768 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1769 * unreserved
1770 *
1771 * @bo: Pointer to buffer
1772 */
1773int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1774{
1775 int ret;
1776
1777 /*
1778 * In the absense of a wait_unlocked API,
1779 * Use the bo::wu_mutex to avoid triggering livelocks due to
1780 * concurrent use of this function. Note that this use of
1781 * bo::wu_mutex can go away if we change locking order to
1782 * mmap_sem -> bo::reserve.
1783 */
1784 ret = mutex_lock_interruptible(&bo->wu_mutex);
1785 if (unlikely(ret != 0))
1786 return -ERESTARTSYS;
1787 if (!ww_mutex_is_locked(&bo->resv->lock))
1788 goto out_unlock;
1789 ret = reservation_object_lock_interruptible(bo->resv, NULL);
1790 if (ret == -EINTR)
1791 ret = -ERESTARTSYS;
1792 if (unlikely(ret != 0))
1793 goto out_unlock;
1794 reservation_object_unlock(bo->resv);
1795
1796out_unlock:
1797 mutex_unlock(&bo->wu_mutex);
1798 return ret;
1799}
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <drm/ttm/ttm_module.h>
35#include <drm/ttm/ttm_bo_driver.h>
36#include <drm/ttm/ttm_placement.h>
37#include <linux/jiffies.h>
38#include <linux/slab.h>
39#include <linux/sched.h>
40#include <linux/mm.h>
41#include <linux/file.h>
42#include <linux/module.h>
43#include <linux/atomic.h>
44#include <linux/dma-resv.h>
45
46static void ttm_bo_global_kobj_release(struct kobject *kobj);
47
48/**
49 * ttm_global_mutex - protecting the global BO state
50 */
51DEFINE_MUTEX(ttm_global_mutex);
52unsigned ttm_bo_glob_use_count;
53struct ttm_bo_global ttm_bo_glob;
54
55static struct attribute ttm_bo_count = {
56 .name = "bo_count",
57 .mode = S_IRUGO
58};
59
60/* default destructor */
61static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
62{
63 kfree(bo);
64}
65
66static inline int ttm_mem_type_from_place(const struct ttm_place *place,
67 uint32_t *mem_type)
68{
69 int pos;
70
71 pos = ffs(place->flags & TTM_PL_MASK_MEM);
72 if (unlikely(!pos))
73 return -EINVAL;
74
75 *mem_type = pos - 1;
76 return 0;
77}
78
79static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
80 int mem_type)
81{
82 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
83
84 drm_printf(p, " has_type: %d\n", man->has_type);
85 drm_printf(p, " use_type: %d\n", man->use_type);
86 drm_printf(p, " flags: 0x%08X\n", man->flags);
87 drm_printf(p, " gpu_offset: 0x%08llX\n", man->gpu_offset);
88 drm_printf(p, " size: %llu\n", man->size);
89 drm_printf(p, " available_caching: 0x%08X\n", man->available_caching);
90 drm_printf(p, " default_caching: 0x%08X\n", man->default_caching);
91 if (mem_type != TTM_PL_SYSTEM)
92 (*man->func->debug)(man, p);
93}
94
95static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
96 struct ttm_placement *placement)
97{
98 struct drm_printer p = drm_debug_printer(TTM_PFX);
99 int i, ret, mem_type;
100
101 drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
102 bo, bo->mem.num_pages, bo->mem.size >> 10,
103 bo->mem.size >> 20);
104 for (i = 0; i < placement->num_placement; i++) {
105 ret = ttm_mem_type_from_place(&placement->placement[i],
106 &mem_type);
107 if (ret)
108 return;
109 drm_printf(&p, " placement[%d]=0x%08X (%d)\n",
110 i, placement->placement[i].flags, mem_type);
111 ttm_mem_type_debug(bo->bdev, &p, mem_type);
112 }
113}
114
115static ssize_t ttm_bo_global_show(struct kobject *kobj,
116 struct attribute *attr,
117 char *buffer)
118{
119 struct ttm_bo_global *glob =
120 container_of(kobj, struct ttm_bo_global, kobj);
121
122 return snprintf(buffer, PAGE_SIZE, "%d\n",
123 atomic_read(&glob->bo_count));
124}
125
126static struct attribute *ttm_bo_global_attrs[] = {
127 &ttm_bo_count,
128 NULL
129};
130
131static const struct sysfs_ops ttm_bo_global_ops = {
132 .show = &ttm_bo_global_show
133};
134
135static struct kobj_type ttm_bo_glob_kobj_type = {
136 .release = &ttm_bo_global_kobj_release,
137 .sysfs_ops = &ttm_bo_global_ops,
138 .default_attrs = ttm_bo_global_attrs
139};
140
141
142static inline uint32_t ttm_bo_type_flags(unsigned type)
143{
144 return 1 << (type);
145}
146
147static void ttm_bo_release_list(struct kref *list_kref)
148{
149 struct ttm_buffer_object *bo =
150 container_of(list_kref, struct ttm_buffer_object, list_kref);
151 struct ttm_bo_device *bdev = bo->bdev;
152 size_t acc_size = bo->acc_size;
153
154 BUG_ON(kref_read(&bo->list_kref));
155 BUG_ON(kref_read(&bo->kref));
156 BUG_ON(atomic_read(&bo->cpu_writers));
157 BUG_ON(bo->mem.mm_node != NULL);
158 BUG_ON(!list_empty(&bo->lru));
159 BUG_ON(!list_empty(&bo->ddestroy));
160 ttm_tt_destroy(bo->ttm);
161 atomic_dec(&bo->bdev->glob->bo_count);
162 dma_fence_put(bo->moving);
163 if (!ttm_bo_uses_embedded_gem_object(bo))
164 dma_resv_fini(&bo->base._resv);
165 mutex_destroy(&bo->wu_mutex);
166 bo->destroy(bo);
167 ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
168}
169
170static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
171 struct ttm_mem_reg *mem)
172{
173 struct ttm_bo_device *bdev = bo->bdev;
174 struct ttm_mem_type_manager *man;
175
176 dma_resv_assert_held(bo->base.resv);
177
178 if (!list_empty(&bo->lru))
179 return;
180
181 if (mem->placement & TTM_PL_FLAG_NO_EVICT)
182 return;
183
184 man = &bdev->man[mem->mem_type];
185 list_add_tail(&bo->lru, &man->lru[bo->priority]);
186 kref_get(&bo->list_kref);
187
188 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
189 !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
190 TTM_PAGE_FLAG_SWAPPED))) {
191 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
192 kref_get(&bo->list_kref);
193 }
194}
195
196void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
197{
198 ttm_bo_add_mem_to_lru(bo, &bo->mem);
199}
200EXPORT_SYMBOL(ttm_bo_add_to_lru);
201
202static void ttm_bo_ref_bug(struct kref *list_kref)
203{
204 BUG();
205}
206
207void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
208{
209 struct ttm_bo_device *bdev = bo->bdev;
210 bool notify = false;
211
212 if (!list_empty(&bo->swap)) {
213 list_del_init(&bo->swap);
214 kref_put(&bo->list_kref, ttm_bo_ref_bug);
215 notify = true;
216 }
217 if (!list_empty(&bo->lru)) {
218 list_del_init(&bo->lru);
219 kref_put(&bo->list_kref, ttm_bo_ref_bug);
220 notify = true;
221 }
222
223 if (notify && bdev->driver->del_from_lru_notify)
224 bdev->driver->del_from_lru_notify(bo);
225}
226
227void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
228{
229 struct ttm_bo_global *glob = bo->bdev->glob;
230
231 spin_lock(&glob->lru_lock);
232 ttm_bo_del_from_lru(bo);
233 spin_unlock(&glob->lru_lock);
234}
235EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
236
237static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
238 struct ttm_buffer_object *bo)
239{
240 if (!pos->first)
241 pos->first = bo;
242 pos->last = bo;
243}
244
245void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
246 struct ttm_lru_bulk_move *bulk)
247{
248 dma_resv_assert_held(bo->base.resv);
249
250 ttm_bo_del_from_lru(bo);
251 ttm_bo_add_to_lru(bo);
252
253 if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
254 switch (bo->mem.mem_type) {
255 case TTM_PL_TT:
256 ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
257 break;
258
259 case TTM_PL_VRAM:
260 ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
261 break;
262 }
263 if (bo->ttm && !(bo->ttm->page_flags &
264 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
265 ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
266 }
267}
268EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
269
270void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
271{
272 unsigned i;
273
274 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
275 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
276 struct ttm_mem_type_manager *man;
277
278 if (!pos->first)
279 continue;
280
281 dma_resv_assert_held(pos->first->base.resv);
282 dma_resv_assert_held(pos->last->base.resv);
283
284 man = &pos->first->bdev->man[TTM_PL_TT];
285 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
286 &pos->last->lru);
287 }
288
289 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
290 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
291 struct ttm_mem_type_manager *man;
292
293 if (!pos->first)
294 continue;
295
296 dma_resv_assert_held(pos->first->base.resv);
297 dma_resv_assert_held(pos->last->base.resv);
298
299 man = &pos->first->bdev->man[TTM_PL_VRAM];
300 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
301 &pos->last->lru);
302 }
303
304 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
305 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
306 struct list_head *lru;
307
308 if (!pos->first)
309 continue;
310
311 dma_resv_assert_held(pos->first->base.resv);
312 dma_resv_assert_held(pos->last->base.resv);
313
314 lru = &pos->first->bdev->glob->swap_lru[i];
315 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
316 }
317}
318EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
319
320static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
321 struct ttm_mem_reg *mem, bool evict,
322 struct ttm_operation_ctx *ctx)
323{
324 struct ttm_bo_device *bdev = bo->bdev;
325 bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
326 bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
327 struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
328 struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
329 int ret = 0;
330
331 if (old_is_pci || new_is_pci ||
332 ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
333 ret = ttm_mem_io_lock(old_man, true);
334 if (unlikely(ret != 0))
335 goto out_err;
336 ttm_bo_unmap_virtual_locked(bo);
337 ttm_mem_io_unlock(old_man);
338 }
339
340 /*
341 * Create and bind a ttm if required.
342 */
343
344 if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
345 if (bo->ttm == NULL) {
346 bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
347 ret = ttm_tt_create(bo, zero);
348 if (ret)
349 goto out_err;
350 }
351
352 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
353 if (ret)
354 goto out_err;
355
356 if (mem->mem_type != TTM_PL_SYSTEM) {
357 ret = ttm_tt_bind(bo->ttm, mem, ctx);
358 if (ret)
359 goto out_err;
360 }
361
362 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
363 if (bdev->driver->move_notify)
364 bdev->driver->move_notify(bo, evict, mem);
365 bo->mem = *mem;
366 mem->mm_node = NULL;
367 goto moved;
368 }
369 }
370
371 if (bdev->driver->move_notify)
372 bdev->driver->move_notify(bo, evict, mem);
373
374 if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
375 !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
376 ret = ttm_bo_move_ttm(bo, ctx, mem);
377 else if (bdev->driver->move)
378 ret = bdev->driver->move(bo, evict, ctx, mem);
379 else
380 ret = ttm_bo_move_memcpy(bo, ctx, mem);
381
382 if (ret) {
383 if (bdev->driver->move_notify) {
384 swap(*mem, bo->mem);
385 bdev->driver->move_notify(bo, false, mem);
386 swap(*mem, bo->mem);
387 }
388
389 goto out_err;
390 }
391
392moved:
393 if (bo->evicted) {
394 if (bdev->driver->invalidate_caches) {
395 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
396 if (ret)
397 pr_err("Can not flush read caches\n");
398 }
399 bo->evicted = false;
400 }
401
402 if (bo->mem.mm_node)
403 bo->offset = (bo->mem.start << PAGE_SHIFT) +
404 bdev->man[bo->mem.mem_type].gpu_offset;
405 else
406 bo->offset = 0;
407
408 ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
409 return 0;
410
411out_err:
412 new_man = &bdev->man[bo->mem.mem_type];
413 if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
414 ttm_tt_destroy(bo->ttm);
415 bo->ttm = NULL;
416 }
417
418 return ret;
419}
420
421/**
422 * Call bo::reserved.
423 * Will release GPU memory type usage on destruction.
424 * This is the place to put in driver specific hooks to release
425 * driver private resources.
426 * Will release the bo::reserved lock.
427 */
428
429static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
430{
431 if (bo->bdev->driver->move_notify)
432 bo->bdev->driver->move_notify(bo, false, NULL);
433
434 ttm_tt_destroy(bo->ttm);
435 bo->ttm = NULL;
436 ttm_bo_mem_put(bo, &bo->mem);
437}
438
439static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
440{
441 int r;
442
443 if (bo->base.resv == &bo->base._resv)
444 return 0;
445
446 BUG_ON(!dma_resv_trylock(&bo->base._resv));
447
448 r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
449 if (r)
450 dma_resv_unlock(&bo->base._resv);
451
452 return r;
453}
454
455static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
456{
457 struct dma_resv_list *fobj;
458 struct dma_fence *fence;
459 int i;
460
461 fobj = dma_resv_get_list(&bo->base._resv);
462 fence = dma_resv_get_excl(&bo->base._resv);
463 if (fence && !fence->ops->signaled)
464 dma_fence_enable_sw_signaling(fence);
465
466 for (i = 0; fobj && i < fobj->shared_count; ++i) {
467 fence = rcu_dereference_protected(fobj->shared[i],
468 dma_resv_held(bo->base.resv));
469
470 if (!fence->ops->signaled)
471 dma_fence_enable_sw_signaling(fence);
472 }
473}
474
475static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
476{
477 struct ttm_bo_device *bdev = bo->bdev;
478 struct ttm_bo_global *glob = bdev->glob;
479 int ret;
480
481 ret = ttm_bo_individualize_resv(bo);
482 if (ret) {
483 /* Last resort, if we fail to allocate memory for the
484 * fences block for the BO to become idle
485 */
486 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
487 30 * HZ);
488 spin_lock(&glob->lru_lock);
489 goto error;
490 }
491
492 spin_lock(&glob->lru_lock);
493 ret = dma_resv_trylock(bo->base.resv) ? 0 : -EBUSY;
494 if (!ret) {
495 if (dma_resv_test_signaled_rcu(&bo->base._resv, true)) {
496 ttm_bo_del_from_lru(bo);
497 spin_unlock(&glob->lru_lock);
498 if (bo->base.resv != &bo->base._resv)
499 dma_resv_unlock(&bo->base._resv);
500
501 ttm_bo_cleanup_memtype_use(bo);
502 dma_resv_unlock(bo->base.resv);
503 return;
504 }
505
506 ttm_bo_flush_all_fences(bo);
507
508 /*
509 * Make NO_EVICT bos immediately available to
510 * shrinkers, now that they are queued for
511 * destruction.
512 */
513 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
514 bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
515 ttm_bo_add_to_lru(bo);
516 }
517
518 dma_resv_unlock(bo->base.resv);
519 }
520 if (bo->base.resv != &bo->base._resv)
521 dma_resv_unlock(&bo->base._resv);
522
523error:
524 kref_get(&bo->list_kref);
525 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
526 spin_unlock(&glob->lru_lock);
527
528 schedule_delayed_work(&bdev->wq,
529 ((HZ / 100) < 1) ? 1 : HZ / 100);
530}
531
532/**
533 * function ttm_bo_cleanup_refs
534 * If bo idle, remove from delayed- and lru lists, and unref.
535 * If not idle, do nothing.
536 *
537 * Must be called with lru_lock and reservation held, this function
538 * will drop the lru lock and optionally the reservation lock before returning.
539 *
540 * @interruptible Any sleeps should occur interruptibly.
541 * @no_wait_gpu Never wait for gpu. Return -EBUSY instead.
542 * @unlock_resv Unlock the reservation lock as well.
543 */
544
545static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
546 bool interruptible, bool no_wait_gpu,
547 bool unlock_resv)
548{
549 struct ttm_bo_global *glob = bo->bdev->glob;
550 struct dma_resv *resv;
551 int ret;
552
553 if (unlikely(list_empty(&bo->ddestroy)))
554 resv = bo->base.resv;
555 else
556 resv = &bo->base._resv;
557
558 if (dma_resv_test_signaled_rcu(resv, true))
559 ret = 0;
560 else
561 ret = -EBUSY;
562
563 if (ret && !no_wait_gpu) {
564 long lret;
565
566 if (unlock_resv)
567 dma_resv_unlock(bo->base.resv);
568 spin_unlock(&glob->lru_lock);
569
570 lret = dma_resv_wait_timeout_rcu(resv, true,
571 interruptible,
572 30 * HZ);
573
574 if (lret < 0)
575 return lret;
576 else if (lret == 0)
577 return -EBUSY;
578
579 spin_lock(&glob->lru_lock);
580 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
581 /*
582 * We raced, and lost, someone else holds the reservation now,
583 * and is probably busy in ttm_bo_cleanup_memtype_use.
584 *
585 * Even if it's not the case, because we finished waiting any
586 * delayed destruction would succeed, so just return success
587 * here.
588 */
589 spin_unlock(&glob->lru_lock);
590 return 0;
591 }
592 ret = 0;
593 }
594
595 if (ret || unlikely(list_empty(&bo->ddestroy))) {
596 if (unlock_resv)
597 dma_resv_unlock(bo->base.resv);
598 spin_unlock(&glob->lru_lock);
599 return ret;
600 }
601
602 ttm_bo_del_from_lru(bo);
603 list_del_init(&bo->ddestroy);
604 kref_put(&bo->list_kref, ttm_bo_ref_bug);
605
606 spin_unlock(&glob->lru_lock);
607 ttm_bo_cleanup_memtype_use(bo);
608
609 if (unlock_resv)
610 dma_resv_unlock(bo->base.resv);
611
612 return 0;
613}
614
615/**
616 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
617 * encountered buffers.
618 */
619static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
620{
621 struct ttm_bo_global *glob = bdev->glob;
622 struct list_head removed;
623 bool empty;
624
625 INIT_LIST_HEAD(&removed);
626
627 spin_lock(&glob->lru_lock);
628 while (!list_empty(&bdev->ddestroy)) {
629 struct ttm_buffer_object *bo;
630
631 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
632 ddestroy);
633 kref_get(&bo->list_kref);
634 list_move_tail(&bo->ddestroy, &removed);
635
636 if (remove_all || bo->base.resv != &bo->base._resv) {
637 spin_unlock(&glob->lru_lock);
638 dma_resv_lock(bo->base.resv, NULL);
639
640 spin_lock(&glob->lru_lock);
641 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
642
643 } else if (dma_resv_trylock(bo->base.resv)) {
644 ttm_bo_cleanup_refs(bo, false, !remove_all, true);
645 } else {
646 spin_unlock(&glob->lru_lock);
647 }
648
649 kref_put(&bo->list_kref, ttm_bo_release_list);
650 spin_lock(&glob->lru_lock);
651 }
652 list_splice_tail(&removed, &bdev->ddestroy);
653 empty = list_empty(&bdev->ddestroy);
654 spin_unlock(&glob->lru_lock);
655
656 return empty;
657}
658
659static void ttm_bo_delayed_workqueue(struct work_struct *work)
660{
661 struct ttm_bo_device *bdev =
662 container_of(work, struct ttm_bo_device, wq.work);
663
664 if (!ttm_bo_delayed_delete(bdev, false))
665 schedule_delayed_work(&bdev->wq,
666 ((HZ / 100) < 1) ? 1 : HZ / 100);
667}
668
669static void ttm_bo_release(struct kref *kref)
670{
671 struct ttm_buffer_object *bo =
672 container_of(kref, struct ttm_buffer_object, kref);
673 struct ttm_bo_device *bdev = bo->bdev;
674 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
675
676 if (bo->bdev->driver->release_notify)
677 bo->bdev->driver->release_notify(bo);
678
679 drm_vma_offset_remove(&bdev->vma_manager, &bo->base.vma_node);
680 ttm_mem_io_lock(man, false);
681 ttm_mem_io_free_vm(bo);
682 ttm_mem_io_unlock(man);
683 ttm_bo_cleanup_refs_or_queue(bo);
684 kref_put(&bo->list_kref, ttm_bo_release_list);
685}
686
687void ttm_bo_put(struct ttm_buffer_object *bo)
688{
689 kref_put(&bo->kref, ttm_bo_release);
690}
691EXPORT_SYMBOL(ttm_bo_put);
692
693int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
694{
695 return cancel_delayed_work_sync(&bdev->wq);
696}
697EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
698
699void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
700{
701 if (resched)
702 schedule_delayed_work(&bdev->wq,
703 ((HZ / 100) < 1) ? 1 : HZ / 100);
704}
705EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
706
707static int ttm_bo_evict(struct ttm_buffer_object *bo,
708 struct ttm_operation_ctx *ctx)
709{
710 struct ttm_bo_device *bdev = bo->bdev;
711 struct ttm_mem_reg evict_mem;
712 struct ttm_placement placement;
713 int ret = 0;
714
715 dma_resv_assert_held(bo->base.resv);
716
717 placement.num_placement = 0;
718 placement.num_busy_placement = 0;
719 bdev->driver->evict_flags(bo, &placement);
720
721 if (!placement.num_placement && !placement.num_busy_placement) {
722 ret = ttm_bo_pipeline_gutting(bo);
723 if (ret)
724 return ret;
725
726 return ttm_tt_create(bo, false);
727 }
728
729 evict_mem = bo->mem;
730 evict_mem.mm_node = NULL;
731 evict_mem.bus.io_reserved_vm = false;
732 evict_mem.bus.io_reserved_count = 0;
733
734 ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
735 if (ret) {
736 if (ret != -ERESTARTSYS) {
737 pr_err("Failed to find memory space for buffer 0x%p eviction\n",
738 bo);
739 ttm_bo_mem_space_debug(bo, &placement);
740 }
741 goto out;
742 }
743
744 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
745 if (unlikely(ret)) {
746 if (ret != -ERESTARTSYS)
747 pr_err("Buffer eviction failed\n");
748 ttm_bo_mem_put(bo, &evict_mem);
749 goto out;
750 }
751 bo->evicted = true;
752out:
753 return ret;
754}
755
756bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
757 const struct ttm_place *place)
758{
759 /* Don't evict this BO if it's outside of the
760 * requested placement range
761 */
762 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
763 (place->lpfn && place->lpfn <= bo->mem.start))
764 return false;
765
766 return true;
767}
768EXPORT_SYMBOL(ttm_bo_eviction_valuable);
769
770/**
771 * Check the target bo is allowable to be evicted or swapout, including cases:
772 *
773 * a. if share same reservation object with ctx->resv, have assumption
774 * reservation objects should already be locked, so not lock again and
775 * return true directly when either the opreation allow_reserved_eviction
776 * or the target bo already is in delayed free list;
777 *
778 * b. Otherwise, trylock it.
779 */
780static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
781 struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
782{
783 bool ret = false;
784
785 if (bo->base.resv == ctx->resv) {
786 dma_resv_assert_held(bo->base.resv);
787 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
788 || !list_empty(&bo->ddestroy))
789 ret = true;
790 *locked = false;
791 if (busy)
792 *busy = false;
793 } else {
794 ret = dma_resv_trylock(bo->base.resv);
795 *locked = ret;
796 if (busy)
797 *busy = !ret;
798 }
799
800 return ret;
801}
802
803/**
804 * ttm_mem_evict_wait_busy - wait for a busy BO to become available
805 *
806 * @busy_bo: BO which couldn't be locked with trylock
807 * @ctx: operation context
808 * @ticket: acquire ticket
809 *
810 * Try to lock a busy buffer object to avoid failing eviction.
811 */
812static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
813 struct ttm_operation_ctx *ctx,
814 struct ww_acquire_ctx *ticket)
815{
816 int r;
817
818 if (!busy_bo || !ticket)
819 return -EBUSY;
820
821 if (ctx->interruptible)
822 r = dma_resv_lock_interruptible(busy_bo->base.resv,
823 ticket);
824 else
825 r = dma_resv_lock(busy_bo->base.resv, ticket);
826
827 /*
828 * TODO: It would be better to keep the BO locked until allocation is at
829 * least tried one more time, but that would mean a much larger rework
830 * of TTM.
831 */
832 if (!r)
833 dma_resv_unlock(busy_bo->base.resv);
834
835 return r == -EDEADLK ? -EBUSY : r;
836}
837
838static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
839 uint32_t mem_type,
840 const struct ttm_place *place,
841 struct ttm_operation_ctx *ctx,
842 struct ww_acquire_ctx *ticket)
843{
844 struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
845 struct ttm_bo_global *glob = bdev->glob;
846 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
847 bool locked = false;
848 unsigned i;
849 int ret;
850
851 spin_lock(&glob->lru_lock);
852 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
853 list_for_each_entry(bo, &man->lru[i], lru) {
854 bool busy;
855
856 if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
857 &busy)) {
858 if (busy && !busy_bo && ticket !=
859 dma_resv_locking_ctx(bo->base.resv))
860 busy_bo = bo;
861 continue;
862 }
863
864 if (place && !bdev->driver->eviction_valuable(bo,
865 place)) {
866 if (locked)
867 dma_resv_unlock(bo->base.resv);
868 continue;
869 }
870 break;
871 }
872
873 /* If the inner loop terminated early, we have our candidate */
874 if (&bo->lru != &man->lru[i])
875 break;
876
877 bo = NULL;
878 }
879
880 if (!bo) {
881 if (busy_bo)
882 kref_get(&busy_bo->list_kref);
883 spin_unlock(&glob->lru_lock);
884 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
885 if (busy_bo)
886 kref_put(&busy_bo->list_kref, ttm_bo_release_list);
887 return ret;
888 }
889
890 kref_get(&bo->list_kref);
891
892 if (!list_empty(&bo->ddestroy)) {
893 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
894 ctx->no_wait_gpu, locked);
895 kref_put(&bo->list_kref, ttm_bo_release_list);
896 return ret;
897 }
898
899 ttm_bo_del_from_lru(bo);
900 spin_unlock(&glob->lru_lock);
901
902 ret = ttm_bo_evict(bo, ctx);
903 if (locked) {
904 ttm_bo_unreserve(bo);
905 } else {
906 spin_lock(&glob->lru_lock);
907 ttm_bo_add_to_lru(bo);
908 spin_unlock(&glob->lru_lock);
909 }
910
911 kref_put(&bo->list_kref, ttm_bo_release_list);
912 return ret;
913}
914
915void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
916{
917 struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
918
919 if (mem->mm_node)
920 (*man->func->put_node)(man, mem);
921}
922EXPORT_SYMBOL(ttm_bo_mem_put);
923
924/**
925 * Add the last move fence to the BO and reserve a new shared slot.
926 */
927static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
928 struct ttm_mem_type_manager *man,
929 struct ttm_mem_reg *mem)
930{
931 struct dma_fence *fence;
932 int ret;
933
934 spin_lock(&man->move_lock);
935 fence = dma_fence_get(man->move);
936 spin_unlock(&man->move_lock);
937
938 if (fence) {
939 dma_resv_add_shared_fence(bo->base.resv, fence);
940
941 ret = dma_resv_reserve_shared(bo->base.resv, 1);
942 if (unlikely(ret)) {
943 dma_fence_put(fence);
944 return ret;
945 }
946
947 dma_fence_put(bo->moving);
948 bo->moving = fence;
949 }
950
951 return 0;
952}
953
954/**
955 * Repeatedly evict memory from the LRU for @mem_type until we create enough
956 * space, or we've evicted everything and there isn't enough space.
957 */
958static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
959 const struct ttm_place *place,
960 struct ttm_mem_reg *mem,
961 struct ttm_operation_ctx *ctx)
962{
963 struct ttm_bo_device *bdev = bo->bdev;
964 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
965 struct ww_acquire_ctx *ticket;
966 int ret;
967
968 ticket = dma_resv_locking_ctx(bo->base.resv);
969 do {
970 ret = (*man->func->get_node)(man, bo, place, mem);
971 if (unlikely(ret != 0))
972 return ret;
973 if (mem->mm_node)
974 break;
975 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
976 ticket);
977 if (unlikely(ret != 0))
978 return ret;
979 } while (1);
980
981 return ttm_bo_add_move_fence(bo, man, mem);
982}
983
984static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
985 uint32_t cur_placement,
986 uint32_t proposed_placement)
987{
988 uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
989 uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
990
991 /**
992 * Keep current caching if possible.
993 */
994
995 if ((cur_placement & caching) != 0)
996 result |= (cur_placement & caching);
997 else if ((man->default_caching & caching) != 0)
998 result |= man->default_caching;
999 else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1000 result |= TTM_PL_FLAG_CACHED;
1001 else if ((TTM_PL_FLAG_WC & caching) != 0)
1002 result |= TTM_PL_FLAG_WC;
1003 else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1004 result |= TTM_PL_FLAG_UNCACHED;
1005
1006 return result;
1007}
1008
1009static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1010 uint32_t mem_type,
1011 const struct ttm_place *place,
1012 uint32_t *masked_placement)
1013{
1014 uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1015
1016 if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1017 return false;
1018
1019 if ((place->flags & man->available_caching) == 0)
1020 return false;
1021
1022 cur_flags |= (place->flags & man->available_caching);
1023
1024 *masked_placement = cur_flags;
1025 return true;
1026}
1027
1028/**
1029 * ttm_bo_mem_placement - check if placement is compatible
1030 * @bo: BO to find memory for
1031 * @place: where to search
1032 * @mem: the memory object to fill in
1033 * @ctx: operation context
1034 *
1035 * Check if placement is compatible and fill in mem structure.
1036 * Returns -EBUSY if placement won't work or negative error code.
1037 * 0 when placement can be used.
1038 */
1039static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
1040 const struct ttm_place *place,
1041 struct ttm_mem_reg *mem,
1042 struct ttm_operation_ctx *ctx)
1043{
1044 struct ttm_bo_device *bdev = bo->bdev;
1045 uint32_t mem_type = TTM_PL_SYSTEM;
1046 struct ttm_mem_type_manager *man;
1047 uint32_t cur_flags = 0;
1048 int ret;
1049
1050 ret = ttm_mem_type_from_place(place, &mem_type);
1051 if (ret)
1052 return ret;
1053
1054 man = &bdev->man[mem_type];
1055 if (!man->has_type || !man->use_type)
1056 return -EBUSY;
1057
1058 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1059 return -EBUSY;
1060
1061 cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1062 /*
1063 * Use the access and other non-mapping-related flag bits from
1064 * the memory placement flags to the current flags
1065 */
1066 ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1067
1068 mem->mem_type = mem_type;
1069 mem->placement = cur_flags;
1070
1071 if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1072 spin_lock(&bo->bdev->glob->lru_lock);
1073 ttm_bo_del_from_lru(bo);
1074 ttm_bo_add_mem_to_lru(bo, mem);
1075 spin_unlock(&bo->bdev->glob->lru_lock);
1076 }
1077
1078 return 0;
1079}
1080
1081/**
1082 * Creates space for memory region @mem according to its type.
1083 *
1084 * This function first searches for free space in compatible memory types in
1085 * the priority order defined by the driver. If free space isn't found, then
1086 * ttm_bo_mem_force_space is attempted in priority order to evict and find
1087 * space.
1088 */
1089int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1090 struct ttm_placement *placement,
1091 struct ttm_mem_reg *mem,
1092 struct ttm_operation_ctx *ctx)
1093{
1094 struct ttm_bo_device *bdev = bo->bdev;
1095 bool type_found = false;
1096 int i, ret;
1097
1098 ret = dma_resv_reserve_shared(bo->base.resv, 1);
1099 if (unlikely(ret))
1100 return ret;
1101
1102 mem->mm_node = NULL;
1103 for (i = 0; i < placement->num_placement; ++i) {
1104 const struct ttm_place *place = &placement->placement[i];
1105 struct ttm_mem_type_manager *man;
1106
1107 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1108 if (ret == -EBUSY)
1109 continue;
1110 if (ret)
1111 goto error;
1112
1113 type_found = true;
1114 mem->mm_node = NULL;
1115 if (mem->mem_type == TTM_PL_SYSTEM)
1116 return 0;
1117
1118 man = &bdev->man[mem->mem_type];
1119 ret = (*man->func->get_node)(man, bo, place, mem);
1120 if (unlikely(ret))
1121 goto error;
1122
1123 if (mem->mm_node) {
1124 ret = ttm_bo_add_move_fence(bo, man, mem);
1125 if (unlikely(ret)) {
1126 (*man->func->put_node)(man, mem);
1127 goto error;
1128 }
1129 return 0;
1130 }
1131 }
1132
1133 for (i = 0; i < placement->num_busy_placement; ++i) {
1134 const struct ttm_place *place = &placement->busy_placement[i];
1135
1136 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1137 if (ret == -EBUSY)
1138 continue;
1139 if (ret)
1140 goto error;
1141
1142 type_found = true;
1143 mem->mm_node = NULL;
1144 if (mem->mem_type == TTM_PL_SYSTEM)
1145 return 0;
1146
1147 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1148 if (ret == 0 && mem->mm_node)
1149 return 0;
1150
1151 if (ret && ret != -EBUSY)
1152 goto error;
1153 }
1154
1155 ret = -ENOMEM;
1156 if (!type_found) {
1157 pr_err(TTM_PFX "No compatible memory type found\n");
1158 ret = -EINVAL;
1159 }
1160
1161error:
1162 if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1163 spin_lock(&bo->bdev->glob->lru_lock);
1164 ttm_bo_move_to_lru_tail(bo, NULL);
1165 spin_unlock(&bo->bdev->glob->lru_lock);
1166 }
1167
1168 return ret;
1169}
1170EXPORT_SYMBOL(ttm_bo_mem_space);
1171
1172static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1173 struct ttm_placement *placement,
1174 struct ttm_operation_ctx *ctx)
1175{
1176 int ret = 0;
1177 struct ttm_mem_reg mem;
1178
1179 dma_resv_assert_held(bo->base.resv);
1180
1181 mem.num_pages = bo->num_pages;
1182 mem.size = mem.num_pages << PAGE_SHIFT;
1183 mem.page_alignment = bo->mem.page_alignment;
1184 mem.bus.io_reserved_vm = false;
1185 mem.bus.io_reserved_count = 0;
1186 /*
1187 * Determine where to move the buffer.
1188 */
1189 ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1190 if (ret)
1191 goto out_unlock;
1192 ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1193out_unlock:
1194 if (ret && mem.mm_node)
1195 ttm_bo_mem_put(bo, &mem);
1196 return ret;
1197}
1198
1199static bool ttm_bo_places_compat(const struct ttm_place *places,
1200 unsigned num_placement,
1201 struct ttm_mem_reg *mem,
1202 uint32_t *new_flags)
1203{
1204 unsigned i;
1205
1206 for (i = 0; i < num_placement; i++) {
1207 const struct ttm_place *heap = &places[i];
1208
1209 if (mem->mm_node && (mem->start < heap->fpfn ||
1210 (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1211 continue;
1212
1213 *new_flags = heap->flags;
1214 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1215 (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1216 (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1217 (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1218 return true;
1219 }
1220 return false;
1221}
1222
1223bool ttm_bo_mem_compat(struct ttm_placement *placement,
1224 struct ttm_mem_reg *mem,
1225 uint32_t *new_flags)
1226{
1227 if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1228 mem, new_flags))
1229 return true;
1230
1231 if ((placement->busy_placement != placement->placement ||
1232 placement->num_busy_placement > placement->num_placement) &&
1233 ttm_bo_places_compat(placement->busy_placement,
1234 placement->num_busy_placement,
1235 mem, new_flags))
1236 return true;
1237
1238 return false;
1239}
1240EXPORT_SYMBOL(ttm_bo_mem_compat);
1241
1242int ttm_bo_validate(struct ttm_buffer_object *bo,
1243 struct ttm_placement *placement,
1244 struct ttm_operation_ctx *ctx)
1245{
1246 int ret;
1247 uint32_t new_flags;
1248
1249 dma_resv_assert_held(bo->base.resv);
1250 /*
1251 * Check whether we need to move buffer.
1252 */
1253 if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1254 ret = ttm_bo_move_buffer(bo, placement, ctx);
1255 if (ret)
1256 return ret;
1257 } else {
1258 /*
1259 * Use the access and other non-mapping-related flag bits from
1260 * the compatible memory placement flags to the active flags
1261 */
1262 ttm_flag_masked(&bo->mem.placement, new_flags,
1263 ~TTM_PL_MASK_MEMTYPE);
1264 }
1265 /*
1266 * We might need to add a TTM.
1267 */
1268 if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1269 ret = ttm_tt_create(bo, true);
1270 if (ret)
1271 return ret;
1272 }
1273 return 0;
1274}
1275EXPORT_SYMBOL(ttm_bo_validate);
1276
1277int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1278 struct ttm_buffer_object *bo,
1279 unsigned long size,
1280 enum ttm_bo_type type,
1281 struct ttm_placement *placement,
1282 uint32_t page_alignment,
1283 struct ttm_operation_ctx *ctx,
1284 size_t acc_size,
1285 struct sg_table *sg,
1286 struct dma_resv *resv,
1287 void (*destroy) (struct ttm_buffer_object *))
1288{
1289 int ret = 0;
1290 unsigned long num_pages;
1291 struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1292 bool locked;
1293
1294 ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1295 if (ret) {
1296 pr_err("Out of kernel memory\n");
1297 if (destroy)
1298 (*destroy)(bo);
1299 else
1300 kfree(bo);
1301 return -ENOMEM;
1302 }
1303
1304 num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1305 if (num_pages == 0) {
1306 pr_err("Illegal buffer object size\n");
1307 if (destroy)
1308 (*destroy)(bo);
1309 else
1310 kfree(bo);
1311 ttm_mem_global_free(mem_glob, acc_size);
1312 return -EINVAL;
1313 }
1314 bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1315
1316 kref_init(&bo->kref);
1317 kref_init(&bo->list_kref);
1318 atomic_set(&bo->cpu_writers, 0);
1319 INIT_LIST_HEAD(&bo->lru);
1320 INIT_LIST_HEAD(&bo->ddestroy);
1321 INIT_LIST_HEAD(&bo->swap);
1322 INIT_LIST_HEAD(&bo->io_reserve_lru);
1323 mutex_init(&bo->wu_mutex);
1324 bo->bdev = bdev;
1325 bo->type = type;
1326 bo->num_pages = num_pages;
1327 bo->mem.size = num_pages << PAGE_SHIFT;
1328 bo->mem.mem_type = TTM_PL_SYSTEM;
1329 bo->mem.num_pages = bo->num_pages;
1330 bo->mem.mm_node = NULL;
1331 bo->mem.page_alignment = page_alignment;
1332 bo->mem.bus.io_reserved_vm = false;
1333 bo->mem.bus.io_reserved_count = 0;
1334 bo->moving = NULL;
1335 bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1336 bo->acc_size = acc_size;
1337 bo->sg = sg;
1338 if (resv) {
1339 bo->base.resv = resv;
1340 dma_resv_assert_held(bo->base.resv);
1341 } else {
1342 bo->base.resv = &bo->base._resv;
1343 }
1344 if (!ttm_bo_uses_embedded_gem_object(bo)) {
1345 /*
1346 * bo.gem is not initialized, so we have to setup the
1347 * struct elements we want use regardless.
1348 */
1349 dma_resv_init(&bo->base._resv);
1350 drm_vma_node_reset(&bo->base.vma_node);
1351 }
1352 atomic_inc(&bo->bdev->glob->bo_count);
1353
1354 /*
1355 * For ttm_bo_type_device buffers, allocate
1356 * address space from the device.
1357 */
1358 if (bo->type == ttm_bo_type_device ||
1359 bo->type == ttm_bo_type_sg)
1360 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->base.vma_node,
1361 bo->mem.num_pages);
1362
1363 /* passed reservation objects should already be locked,
1364 * since otherwise lockdep will be angered in radeon.
1365 */
1366 if (!resv) {
1367 locked = dma_resv_trylock(bo->base.resv);
1368 WARN_ON(!locked);
1369 }
1370
1371 if (likely(!ret))
1372 ret = ttm_bo_validate(bo, placement, ctx);
1373
1374 if (unlikely(ret)) {
1375 if (!resv)
1376 ttm_bo_unreserve(bo);
1377
1378 ttm_bo_put(bo);
1379 return ret;
1380 }
1381
1382 if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1383 spin_lock(&bdev->glob->lru_lock);
1384 ttm_bo_add_to_lru(bo);
1385 spin_unlock(&bdev->glob->lru_lock);
1386 }
1387
1388 return ret;
1389}
1390EXPORT_SYMBOL(ttm_bo_init_reserved);
1391
1392int ttm_bo_init(struct ttm_bo_device *bdev,
1393 struct ttm_buffer_object *bo,
1394 unsigned long size,
1395 enum ttm_bo_type type,
1396 struct ttm_placement *placement,
1397 uint32_t page_alignment,
1398 bool interruptible,
1399 size_t acc_size,
1400 struct sg_table *sg,
1401 struct dma_resv *resv,
1402 void (*destroy) (struct ttm_buffer_object *))
1403{
1404 struct ttm_operation_ctx ctx = { interruptible, false };
1405 int ret;
1406
1407 ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1408 page_alignment, &ctx, acc_size,
1409 sg, resv, destroy);
1410 if (ret)
1411 return ret;
1412
1413 if (!resv)
1414 ttm_bo_unreserve(bo);
1415
1416 return 0;
1417}
1418EXPORT_SYMBOL(ttm_bo_init);
1419
1420size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1421 unsigned long bo_size,
1422 unsigned struct_size)
1423{
1424 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1425 size_t size = 0;
1426
1427 size += ttm_round_pot(struct_size);
1428 size += ttm_round_pot(npages * sizeof(void *));
1429 size += ttm_round_pot(sizeof(struct ttm_tt));
1430 return size;
1431}
1432EXPORT_SYMBOL(ttm_bo_acc_size);
1433
1434size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1435 unsigned long bo_size,
1436 unsigned struct_size)
1437{
1438 unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1439 size_t size = 0;
1440
1441 size += ttm_round_pot(struct_size);
1442 size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1443 size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1444 return size;
1445}
1446EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1447
1448int ttm_bo_create(struct ttm_bo_device *bdev,
1449 unsigned long size,
1450 enum ttm_bo_type type,
1451 struct ttm_placement *placement,
1452 uint32_t page_alignment,
1453 bool interruptible,
1454 struct ttm_buffer_object **p_bo)
1455{
1456 struct ttm_buffer_object *bo;
1457 size_t acc_size;
1458 int ret;
1459
1460 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1461 if (unlikely(bo == NULL))
1462 return -ENOMEM;
1463
1464 acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1465 ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1466 interruptible, acc_size,
1467 NULL, NULL, NULL);
1468 if (likely(ret == 0))
1469 *p_bo = bo;
1470
1471 return ret;
1472}
1473EXPORT_SYMBOL(ttm_bo_create);
1474
1475static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1476 unsigned mem_type)
1477{
1478 struct ttm_operation_ctx ctx = {
1479 .interruptible = false,
1480 .no_wait_gpu = false,
1481 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1482 };
1483 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1484 struct ttm_bo_global *glob = bdev->glob;
1485 struct dma_fence *fence;
1486 int ret;
1487 unsigned i;
1488
1489 /*
1490 * Can't use standard list traversal since we're unlocking.
1491 */
1492
1493 spin_lock(&glob->lru_lock);
1494 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1495 while (!list_empty(&man->lru[i])) {
1496 spin_unlock(&glob->lru_lock);
1497 ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1498 NULL);
1499 if (ret)
1500 return ret;
1501 spin_lock(&glob->lru_lock);
1502 }
1503 }
1504 spin_unlock(&glob->lru_lock);
1505
1506 spin_lock(&man->move_lock);
1507 fence = dma_fence_get(man->move);
1508 spin_unlock(&man->move_lock);
1509
1510 if (fence) {
1511 ret = dma_fence_wait(fence, false);
1512 dma_fence_put(fence);
1513 if (ret)
1514 return ret;
1515 }
1516
1517 return 0;
1518}
1519
1520int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1521{
1522 struct ttm_mem_type_manager *man;
1523 int ret = -EINVAL;
1524
1525 if (mem_type >= TTM_NUM_MEM_TYPES) {
1526 pr_err("Illegal memory type %d\n", mem_type);
1527 return ret;
1528 }
1529 man = &bdev->man[mem_type];
1530
1531 if (!man->has_type) {
1532 pr_err("Trying to take down uninitialized memory manager type %u\n",
1533 mem_type);
1534 return ret;
1535 }
1536
1537 man->use_type = false;
1538 man->has_type = false;
1539
1540 ret = 0;
1541 if (mem_type > 0) {
1542 ret = ttm_bo_force_list_clean(bdev, mem_type);
1543 if (ret) {
1544 pr_err("Cleanup eviction failed\n");
1545 return ret;
1546 }
1547
1548 ret = (*man->func->takedown)(man);
1549 }
1550
1551 dma_fence_put(man->move);
1552 man->move = NULL;
1553
1554 return ret;
1555}
1556EXPORT_SYMBOL(ttm_bo_clean_mm);
1557
1558int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1559{
1560 struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1561
1562 if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1563 pr_err("Illegal memory manager memory type %u\n", mem_type);
1564 return -EINVAL;
1565 }
1566
1567 if (!man->has_type) {
1568 pr_err("Memory type %u has not been initialized\n", mem_type);
1569 return 0;
1570 }
1571
1572 return ttm_bo_force_list_clean(bdev, mem_type);
1573}
1574EXPORT_SYMBOL(ttm_bo_evict_mm);
1575
1576int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1577 unsigned long p_size)
1578{
1579 int ret;
1580 struct ttm_mem_type_manager *man;
1581 unsigned i;
1582
1583 BUG_ON(type >= TTM_NUM_MEM_TYPES);
1584 man = &bdev->man[type];
1585 BUG_ON(man->has_type);
1586 man->io_reserve_fastpath = true;
1587 man->use_io_reserve_lru = false;
1588 mutex_init(&man->io_reserve_mutex);
1589 spin_lock_init(&man->move_lock);
1590 INIT_LIST_HEAD(&man->io_reserve_lru);
1591
1592 ret = bdev->driver->init_mem_type(bdev, type, man);
1593 if (ret)
1594 return ret;
1595 man->bdev = bdev;
1596
1597 if (type != TTM_PL_SYSTEM) {
1598 ret = (*man->func->init)(man, p_size);
1599 if (ret)
1600 return ret;
1601 }
1602 man->has_type = true;
1603 man->use_type = true;
1604 man->size = p_size;
1605
1606 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1607 INIT_LIST_HEAD(&man->lru[i]);
1608 man->move = NULL;
1609
1610 return 0;
1611}
1612EXPORT_SYMBOL(ttm_bo_init_mm);
1613
1614static void ttm_bo_global_kobj_release(struct kobject *kobj)
1615{
1616 struct ttm_bo_global *glob =
1617 container_of(kobj, struct ttm_bo_global, kobj);
1618
1619 __free_page(glob->dummy_read_page);
1620}
1621
1622static void ttm_bo_global_release(void)
1623{
1624 struct ttm_bo_global *glob = &ttm_bo_glob;
1625
1626 mutex_lock(&ttm_global_mutex);
1627 if (--ttm_bo_glob_use_count > 0)
1628 goto out;
1629
1630 kobject_del(&glob->kobj);
1631 kobject_put(&glob->kobj);
1632 ttm_mem_global_release(&ttm_mem_glob);
1633 memset(glob, 0, sizeof(*glob));
1634out:
1635 mutex_unlock(&ttm_global_mutex);
1636}
1637
1638static int ttm_bo_global_init(void)
1639{
1640 struct ttm_bo_global *glob = &ttm_bo_glob;
1641 int ret = 0;
1642 unsigned i;
1643
1644 mutex_lock(&ttm_global_mutex);
1645 if (++ttm_bo_glob_use_count > 1)
1646 goto out;
1647
1648 ret = ttm_mem_global_init(&ttm_mem_glob);
1649 if (ret)
1650 goto out;
1651
1652 spin_lock_init(&glob->lru_lock);
1653 glob->mem_glob = &ttm_mem_glob;
1654 glob->mem_glob->bo_glob = glob;
1655 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1656
1657 if (unlikely(glob->dummy_read_page == NULL)) {
1658 ret = -ENOMEM;
1659 goto out;
1660 }
1661
1662 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1663 INIT_LIST_HEAD(&glob->swap_lru[i]);
1664 INIT_LIST_HEAD(&glob->device_list);
1665 atomic_set(&glob->bo_count, 0);
1666
1667 ret = kobject_init_and_add(
1668 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1669 if (unlikely(ret != 0))
1670 kobject_put(&glob->kobj);
1671out:
1672 mutex_unlock(&ttm_global_mutex);
1673 return ret;
1674}
1675
1676int ttm_bo_device_release(struct ttm_bo_device *bdev)
1677{
1678 int ret = 0;
1679 unsigned i = TTM_NUM_MEM_TYPES;
1680 struct ttm_mem_type_manager *man;
1681 struct ttm_bo_global *glob = bdev->glob;
1682
1683 while (i--) {
1684 man = &bdev->man[i];
1685 if (man->has_type) {
1686 man->use_type = false;
1687 if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1688 ret = -EBUSY;
1689 pr_err("DRM memory manager type %d is not clean\n",
1690 i);
1691 }
1692 man->has_type = false;
1693 }
1694 }
1695
1696 mutex_lock(&ttm_global_mutex);
1697 list_del(&bdev->device_list);
1698 mutex_unlock(&ttm_global_mutex);
1699
1700 cancel_delayed_work_sync(&bdev->wq);
1701
1702 if (ttm_bo_delayed_delete(bdev, true))
1703 pr_debug("Delayed destroy list was clean\n");
1704
1705 spin_lock(&glob->lru_lock);
1706 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1707 if (list_empty(&bdev->man[0].lru[0]))
1708 pr_debug("Swap list %d was clean\n", i);
1709 spin_unlock(&glob->lru_lock);
1710
1711 drm_vma_offset_manager_destroy(&bdev->vma_manager);
1712
1713 if (!ret)
1714 ttm_bo_global_release();
1715
1716 return ret;
1717}
1718EXPORT_SYMBOL(ttm_bo_device_release);
1719
1720int ttm_bo_device_init(struct ttm_bo_device *bdev,
1721 struct ttm_bo_driver *driver,
1722 struct address_space *mapping,
1723 bool need_dma32)
1724{
1725 struct ttm_bo_global *glob = &ttm_bo_glob;
1726 int ret;
1727
1728 ret = ttm_bo_global_init();
1729 if (ret)
1730 return ret;
1731
1732 bdev->driver = driver;
1733
1734 memset(bdev->man, 0, sizeof(bdev->man));
1735
1736 /*
1737 * Initialize the system memory buffer type.
1738 * Other types need to be driver / IOCTL initialized.
1739 */
1740 ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1741 if (unlikely(ret != 0))
1742 goto out_no_sys;
1743
1744 drm_vma_offset_manager_init(&bdev->vma_manager,
1745 DRM_FILE_PAGE_OFFSET_START,
1746 DRM_FILE_PAGE_OFFSET_SIZE);
1747 INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1748 INIT_LIST_HEAD(&bdev->ddestroy);
1749 bdev->dev_mapping = mapping;
1750 bdev->glob = glob;
1751 bdev->need_dma32 = need_dma32;
1752 mutex_lock(&ttm_global_mutex);
1753 list_add_tail(&bdev->device_list, &glob->device_list);
1754 mutex_unlock(&ttm_global_mutex);
1755
1756 return 0;
1757out_no_sys:
1758 ttm_bo_global_release();
1759 return ret;
1760}
1761EXPORT_SYMBOL(ttm_bo_device_init);
1762
1763/*
1764 * buffer object vm functions.
1765 */
1766
1767bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1768{
1769 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1770
1771 if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1772 if (mem->mem_type == TTM_PL_SYSTEM)
1773 return false;
1774
1775 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1776 return false;
1777
1778 if (mem->placement & TTM_PL_FLAG_CACHED)
1779 return false;
1780 }
1781 return true;
1782}
1783
1784void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1785{
1786 struct ttm_bo_device *bdev = bo->bdev;
1787
1788 drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1789 ttm_mem_io_free_vm(bo);
1790}
1791
1792void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1793{
1794 struct ttm_bo_device *bdev = bo->bdev;
1795 struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1796
1797 ttm_mem_io_lock(man, false);
1798 ttm_bo_unmap_virtual_locked(bo);
1799 ttm_mem_io_unlock(man);
1800}
1801
1802
1803EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1804
1805int ttm_bo_wait(struct ttm_buffer_object *bo,
1806 bool interruptible, bool no_wait)
1807{
1808 long timeout = 15 * HZ;
1809
1810 if (no_wait) {
1811 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1812 return 0;
1813 else
1814 return -EBUSY;
1815 }
1816
1817 timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1818 interruptible, timeout);
1819 if (timeout < 0)
1820 return timeout;
1821
1822 if (timeout == 0)
1823 return -EBUSY;
1824
1825 dma_resv_add_excl_fence(bo->base.resv, NULL);
1826 return 0;
1827}
1828EXPORT_SYMBOL(ttm_bo_wait);
1829
1830int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1831{
1832 int ret = 0;
1833
1834 /*
1835 * Using ttm_bo_reserve makes sure the lru lists are updated.
1836 */
1837
1838 ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1839 if (unlikely(ret != 0))
1840 return ret;
1841 ret = ttm_bo_wait(bo, true, no_wait);
1842 if (likely(ret == 0))
1843 atomic_inc(&bo->cpu_writers);
1844 ttm_bo_unreserve(bo);
1845 return ret;
1846}
1847EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1848
1849void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1850{
1851 atomic_dec(&bo->cpu_writers);
1852}
1853EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1854
1855/**
1856 * A buffer object shrink method that tries to swap out the first
1857 * buffer object on the bo_global::swap_lru list.
1858 */
1859int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1860{
1861 struct ttm_buffer_object *bo;
1862 int ret = -EBUSY;
1863 bool locked;
1864 unsigned i;
1865
1866 spin_lock(&glob->lru_lock);
1867 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1868 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1869 if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1870 NULL)) {
1871 ret = 0;
1872 break;
1873 }
1874 }
1875 if (!ret)
1876 break;
1877 }
1878
1879 if (ret) {
1880 spin_unlock(&glob->lru_lock);
1881 return ret;
1882 }
1883
1884 kref_get(&bo->list_kref);
1885
1886 if (!list_empty(&bo->ddestroy)) {
1887 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1888 kref_put(&bo->list_kref, ttm_bo_release_list);
1889 return ret;
1890 }
1891
1892 ttm_bo_del_from_lru(bo);
1893 spin_unlock(&glob->lru_lock);
1894
1895 /**
1896 * Move to system cached
1897 */
1898
1899 if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1900 bo->ttm->caching_state != tt_cached) {
1901 struct ttm_operation_ctx ctx = { false, false };
1902 struct ttm_mem_reg evict_mem;
1903
1904 evict_mem = bo->mem;
1905 evict_mem.mm_node = NULL;
1906 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1907 evict_mem.mem_type = TTM_PL_SYSTEM;
1908
1909 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1910 if (unlikely(ret != 0))
1911 goto out;
1912 }
1913
1914 /**
1915 * Make sure BO is idle.
1916 */
1917
1918 ret = ttm_bo_wait(bo, false, false);
1919 if (unlikely(ret != 0))
1920 goto out;
1921
1922 ttm_bo_unmap_virtual(bo);
1923
1924 /**
1925 * Swap out. Buffer will be swapped in again as soon as
1926 * anyone tries to access a ttm page.
1927 */
1928
1929 if (bo->bdev->driver->swap_notify)
1930 bo->bdev->driver->swap_notify(bo);
1931
1932 ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1933out:
1934
1935 /**
1936 *
1937 * Unreserve without putting on LRU to avoid swapping out an
1938 * already swapped buffer.
1939 */
1940 if (locked)
1941 dma_resv_unlock(bo->base.resv);
1942 kref_put(&bo->list_kref, ttm_bo_release_list);
1943 return ret;
1944}
1945EXPORT_SYMBOL(ttm_bo_swapout);
1946
1947void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1948{
1949 struct ttm_operation_ctx ctx = {
1950 .interruptible = false,
1951 .no_wait_gpu = false
1952 };
1953
1954 while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1955 ;
1956}
1957EXPORT_SYMBOL(ttm_bo_swapout_all);
1958
1959/**
1960 * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1961 * unreserved
1962 *
1963 * @bo: Pointer to buffer
1964 */
1965int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1966{
1967 int ret;
1968
1969 /*
1970 * In the absense of a wait_unlocked API,
1971 * Use the bo::wu_mutex to avoid triggering livelocks due to
1972 * concurrent use of this function. Note that this use of
1973 * bo::wu_mutex can go away if we change locking order to
1974 * mmap_sem -> bo::reserve.
1975 */
1976 ret = mutex_lock_interruptible(&bo->wu_mutex);
1977 if (unlikely(ret != 0))
1978 return -ERESTARTSYS;
1979 if (!dma_resv_is_locked(bo->base.resv))
1980 goto out_unlock;
1981 ret = dma_resv_lock_interruptible(bo->base.resv, NULL);
1982 if (ret == -EINTR)
1983 ret = -ERESTARTSYS;
1984 if (unlikely(ret != 0))
1985 goto out_unlock;
1986 dma_resv_unlock(bo->base.resv);
1987
1988out_unlock:
1989 mutex_unlock(&bo->wu_mutex);
1990 return ret;
1991}